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Released Pokémon Odyssey

This project has a release available. The full version is still a work in progress.
Project Status
Completed
Project Version
4.0.3
ETA Next Version
Jun 13, 2025

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Hey everyone! Long story short: this is a crossover project featuring Pokémon, Made in Abyss, and Etrian Odyssey.
It's a dungeon-crawler with a story-driven focus, but don't worry, you don't need to be familiar with Etrian Odyssey or Made in Abyss to enjoy the game to the fullest!


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On an island in the middle of the sea stands a massive maze knows as the "Yggdrasil Labyrinth", which has been attracting adventurers from all over the world for years.
No one knows how deep it goes, or if there's anything at its end.
Some say there's a treasure of immeasurable value hidden within, while others claim the remnants of a lost civilization lie there.
In the game you'll play as Nyx, a young adventurer who joins the guild of Talrega with the goal of unraveling the Labyrinth's mysteries.
But something goes terribly wrong…


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  • Base ➜ Fire Red (U) 1.0
  • Status ➜ COMPLETE (v4.0.3)
  • Language ➜ English

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★ NYX


A young adventurer determined to conquer the Yggdrasil Labyrinth.
Skilled in Pokémon battles, she strives to follow in her sister's footsteps with the goal of surpassing her.

Signature Pokémon: Plusle & Minun

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★ AIMÉE


The top explorer from the Adventurers Guild in the city of Talrega and Nyx's older sister.
She's the author of most of the books and guides on the labyrinth, its treasures, and its many mysteries.

Signature Pokémon: ???

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★ ETHAN


An introverted and socially awkward boy who joins Nyx on her adventure.
He shares a mysterious connection with Aimée.

Signature Pokémon: Kecleon.

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★ OLYMPIA


An enigmatic girl who accompanies Nyx on her journey.
She insists she's a robot and behaves accordingly.
She also shares a mysterious connection with Aimée.

Signature Pokémon: Mawile.
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  • A brand-new story and region to explore;
  • Double battles only, unless you only have one Pokémon;
  • No Gym Leaders, evil teams, or Elite Four—it's all about exploration!
  • All Pokémon have been rebalanced;
  • Introducing new regional forms: the Etrian Variants!
  • Available Pokémon: Generations 1–3 and cross-gen evolutions;
  • Multiple difficulty levels and soft level caps;
  • EV/IV screen, nature colors, and more;
  • No healing items during battle;
  • Etrian Odyssey-inspired features: Mining and Gathering points, Naval Exploration, Shop Upgrades, and FOEs;
  • A variety of sidequests with a dedicated sidequest menu;
  • Wonder Trade functionality;
  • Every Pokémon in the game has perfect 31 IVs, so no need to farm or breed for a decent one;
  • No EVs gained from defeating Pokémon, you'll need Power Items or Vitamins (at a reduced price) to boost them;
  • Change your Pokémon's Nature and Ability through in-game functions;
  • Exp. Share mechanic similar to Gen VI;
  • A brand-new soundtrack!

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► Latest (ENG): Pokémon Odyssey COMPLETE (v4.0.3)
This is just a .ups patch file. In order to play this game you'll have to apply this patch on a Pokémon Fire Red (U) (Squirrels) rom.

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► Discord ➜ Click here
► Wild encounters and Items ➜ Click here
► Pokémon stats, learnset, Etrian Variants etc. ➜ Click here
► Level Caps, Bosses, Naval Exploration map, Sidequests ➜ Click here
► Teambuilding Guide ➜ Click here


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► Magiscarf ➜ Tilesets
► Aveontrainer ➜ Battle Backgrounds
► The-Red-eX ➜ Tilesets
► kWharever ➜ Battle Backgrounds
► BadassBill ➜ Tilesets
► Kyledove ➜ Tilesets
► Kalarie ➜ Sprites (OW)
► Avon, SphericalIce, DoesntKnowHowToPlay, FBI, Daniils, Squeetz, Jambo51, VersekrDark ➜ Asm

► Ekat ➜ Tilesets
► Pyvetal ➜ Tilesets
► Aloeva ➜ Regional variants' concept art
► Mediko ➜ Regional variant' concept art and sprite
► shinyzura ➜ Improved trainer sprites
► Swonkfish ➜ Pixel art, regional variants' sprite


► BETA TESTERS ➜ Hapu, FlamingDragonGaming, LanturnJoe, Nah.png, Prof. A. Malgam, Streyar, Dekadent, Hallan, Seraphim, Ayato612, Yuni-1311, Zachsz, .fennec., Drextruction, Swonkfish, MissMidori, BurningMyDread, Meomite, Ponk, Ayrei, Vytron, Saiph, Flygon, Lusio, Dr. Jaska, Mediko.


 
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Beta 2.0 is finally out!
Thank you very much for your patience and support over the last 6 months; the translation team (Zeppho, Doctor Locke, Xariod) worked non-stop, so huge thanks to them too!
You'll find the download link and the documentation in ⁠the first post.
What can I say? Let's dive into the Abyss!
 
Beta 2.0.2 available.
Changelog:
  • Fixed an issue regarding Dawn Stone not working on Kirlia;
  • Fixed an issue regarding Link Stone not working on Haunter;
  • Fixed an issue regarding Brave Bird having less PP than intended;
  • Fixed an issue regarding shiny Pokémon appearance after trading with the bug catcher at the Krabby Club;
  • Fixed some typos/errors;
  • Fixed some movement permissions;
  • "Waterfall" added to Whiscash, Quagsire and Poliwrath's learnset.
  • Fixed an issue regarding traded Pokémon obedience;
  • Removed the use of Field Moves (Waterfall, Dig etc etc) from the Pokémon Menu;
  • Added Farfetch'd (Galar) and Sirfetch'd.
 
Hello hello, V2.0.3 is out, here's the changelog!
  • Fixed an issue regarding Salamence's cry;
  • Fixed an issue regarding Electivire's learnset;
  • Fixed an issue regarding Tinted Lens description;
  • Fixed some typos;
  • Doduo, Mr.Mime and Houndour added to Talrega's wonder trade.

I also added an evaluation questionnaire for Beta 2.0 in the first post!

Last but not least... I decided to replace the Explorer Kit with the Adventurer Codex, a useful item similar to the Pokédex!
This item and all the things I'll be posting from now on will be available in version 2.5 (release date TBD).

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And for the curious ones, here's a spoiler of the FirstPersonView images of all the Strata!
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Hello hello, it's time for a huge update a.k.a. "What did Paco do during all these months?"

First of all, huge thanks to ENLS for helping me formatting the first post, now it looks much better.
As for the news...

  • SEE YOU AT EEVEE EXPO!
I'm happy to announce that Pokémon Odyssey will be one of the headlines for the upcoming EeveeExpo!
Here's a promotional image I made:

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  • GRAPHICAL UPDATE
Not much to say: Before/After

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  • MORE PORTRAITS!
From v2.5 each major character will have new portraits based on their mood.

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  • A NEW POWER...
"May this power of mine help thee, children of chaos".
Plusle & Minun (Nyx), Kecleon (Ethan) and Mawile (Olympia) will unlock a new power after a certain event of beta 3.0: Battle Bond.
Here's a sneak peek at Ethan's Kecleon and Olympia's Mawile.

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  • ETRIAN VARIANTS
Etrian Variants are regional forms based off Etrian Odyssey's enemies and playable classes; here's a sneak peek!

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Starting from the top-left corner:
Rattata, Raticate, Sandshrew, Sandslash
Krabby, Kingler, Barboach, Whiscash
Smoochum, Jynx, Ponyta, Rapidash
Poochyena, Mightyena, Meganium, Feraligatr
Aerodactyl, Stantler, Relicanth, Mismagius
  • PRE-BATTLE MUGSHOTS
I added pre-battle mugshots to every major fight (and a new sprite for Olympia, cause the first one had a derp face)

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  • BETA 2.5 RELEASE DATE
I'm planning to release Beta 2.5 by the end of October/beginning of November.
This is just a fix/QoL/world expansion update, so you won't be able to progress with the main story, buuuuuuuuut there will be a lot of secondary things to do and more locations to explore, pinky promise!
 
Beta 2.5 is finally out!

Changelog:
  • 3 new secondary islands: Aqua Resort, Jagged Mountain and Faraway Island;
  • 21 new regional variants: Rattata, Raticate, Sandshrew, Sandslash, Krabby, Kingler, Smoochum, Jynx, Ponyta, Rapidash, Aerodactyl, Meganium, Typhlosion, Feraligatr, Stantler, Poochyena, Mightyena, Barboach, Whiscash, Relicanth, Mismagius;
  • Added lore text on the Third Stratum Stele, in Etria and Etria's Graveyard.
  • Revamped Pokemon icons;
  • Revamped overworld graphics;
  • Revamped overworld sprites;
  • Mood-accurate portraits;
  • Pre-battle mugshots for major boss fights;
  • New move tutors;
  • Initial Stamina value: 10 -> 20;
  • Buffed Stamina value: 20 -> 40;
  • It's now possible to change game difficulty whenever you want by interacting with the poster at Nyx's house;
  • Explorer Kit replaced with Adventurer Codex (basically a Pokedex);
  • Evolution specialist added at the Guild of Talrega (NPC that tells you how to evolve your Pokemon);
  • Fixed a bug regarding shiny encounters becoming Bad Eggs after being captured;
  • Fixed some movement permissions;
  • General buff to underperforming Pokemon.
 
Hello hello, I'm planning to release v2.6 in a week or so!

Changelog
  • Fixed an issue regarding shiny encounters becoming Bad Eggs after being captured (GOD AT LEAST I HOPE SO);
  • Fixed an issue regarding callAsm and battlestring functions;
  • Fixed an issue regarding Choice Scarf not boosting the user's speed;
  • Fixed an issue regarding Technician not boosting low BP moves;
  • Fixed an issue regarding Boomburst not being recognized as a sound-based move;
  • Fixed an issue regarding Sandy Shock's stats;
  • Fixed an issue regarding some learnsets;
  • New Pokémon added: Kleavor (have Scyther reach level 35);
  • New abilities added: Moxie, Defiant, Competitive, Skill Link;
  • New moves added: Shell Smash, Quiver Dance, Stone Edge, Stone Axe (70 BP, 95 Accuracy high-crit move, Kleavor only);
  • Pokémon gender ratio has been set at 50% (except for male/female only species);
  • Learnsets and abilities have been updated (for example Butterfree now learns Quiver Dance, Furret has Fur Coat etc etc);
  • New items added: Eviolite, Rocky Helmet, Flame Orb, Toxic Orb, Life Orb, Assault Vest, Weakness Policy, Light Clay;
  • Sitrus Berry's effect updated: it now restores 25% of max HP instead of just 30 HP;
  • Pokéball containing TMs are now yellow;
  • New move animations for: Mysticalfire, PowerUpPunch, Aura Sphere, Head Smash, Iron Head, Poison Jab, X-Scissor, Icicle Crash, Drain Punch, Shadow Sneak, Aqua Jet, Bullet Punch, Shell Smash;
  • Bag, TM Case and Treasure Pouch have now a better UI;
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  • Reworked TM case: you can now see which Pokémon are compatible with a determined TM before teaching it;
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  • You can now see your team and current game version in the "Continue/New Game" screen;
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  • Hard Mode bosses updated with new held items and moves.
 
Pretty sick dude. Love the ideas you got with the yggdras n stuff. I look forward to it's completion.
 
Pretty sick dude. Love the ideas you got with the yggdras n stuff. I look forward to it's completion.
I’m happy to hear that! If you want to start your playthrough right now know that savefiles are compatible between versions! (Unless you’ve already completed the current beta, and in that case… thank you!)
 
hey,where do i get the item for strenght or strenght because i checked everywhere and i´m stuck
 
Started yesterday and the effort by this team of yours is very very visible. The game is polished w a lot of thought and love put into it. Thank you for such a refreshing twist on this franchise. One of the best one in recent years or at least in my opinion. Im just wondering how to trade certain Pokemons like Magmar n Elekid. Do i need the electirizer, if so where can I get one?

Another thing, is there any repercussion if i were to bench plusle n minun? To the plot or anything will I miss out on anything?

Edit : Umm, i cant open pokemon summary. It crashes the game. they bg and frames are there but all the text is gone and itll cause it to crash when i press back. I restarted to see itll still happening again. Ill attach a picture if it happens on my 3rd try later.
 
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hey,where do i get the item for strenght or strenght because i checked everywhere and i´m stuck
You have to complete a sidequest in Azure Cave (4th Stratum). After that, you'll receive the artifact "Magna Vis", which is basically a key item that replaces Strenght.

Started yesterday and the effort by this team of yours is very very visible. The game is polished w a lot of thought and love put into it. Thank you for such a refreshing twist on this franchise. One of the best one in recent years or at least in my opinion. Im just wondering how to trade certain Pokemons like Magmar n Elekid. Do i need the electirizer, if so where can I get one?

Another thing, is there any repercussion if i were to bench plusle n minun? To the plot or anything will I miss out on anything?

Edit : Umm, i cant open pokemon summary. It crashes the game. they bg and frames are there but all the text is gone and itll cause it to crash when i press back. I restarted to see itll still happening again. Ill attach a picture if it happens on my 3rd try later.

Thanks a bunch for the compliments! Anyway, if you want to know how to evolve your Pokémon you can just check the documentation (link in the first post). You'll need an Electirizer in order to evolve Electabuzz into Electivire, yeah. You can get one by completing a quest in the Rade of Carcino (4th Stratum) or by buying it in Napier's Shop (Aqua Resort, Naval exploration).

Plusle and Minun are not needed, so you can deposit them (at least for now); I won't deny that they will receive... something in the next update, but I won't say anything :^).

Huh, it's the first time I hear that. Anyway, it might be linked to the emulator you're currently using, so I'm gonna ask a few questions in order to see if that's the problem:
1) Are you playing on PC or mobile?
2) Which emulator are you using?

But yeah, let me know if it happens again!
 
You have to complete a sidequest in Azure Cave (4th Stratum). After that, you'll receive the artifact "Magna Vis", which is basically a key item that replaces Strenght.



Thanks a bunch for the compliments! Anyway, if you want to know how to evolve your Pokémon you can just check the documentation (link in the first post). You'll need an Electirizer in order to evolve Electabuzz into Electivire, yeah. You can get one by completing a quest in the Rade of Carcino (4th Stratum) or by buying it in Napier's Shop (Aqua Resort, Naval exploration).

Plusle and Minun are not needed, so you can deposit them (at least for now); I won't deny that they will receive... something in the next update, but I won't say anything :^).

Huh, it's the first time I hear that. Anyway, it might be linked to the emulator you're currently using, so I'm gonna ask a few questions in order to see if that's the problem:
1) Are you playing on PC or mobile?
2) Which emulator are you using?

But yeah, let me know if it happens again!
Hi, thank you for the fast response, ill attach the image if that helps but to answer :

1) Im using a laptop to be precise but the game and overall quality is pristine its just this minor bug that wont allow me to learn new moveset and such so i dont think its my laptop.
2) VisualBoyAdvance, I know uve listed the 2 emulators to play this, but ive already had VBA so i thought it would be fine. Maybe it was the emulator?

After the image im attaching it, i cant go back or do anything though the audio will continue normally. But itll turn black screen. Thank you again :)
 

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Hi, thank you for the fast response, ill attach the image if that helps but to answer :

1) Im using a laptop to be precise but the game and overall quality is pristine its just this minor bug that wont allow me to learn new moveset and such so i dont think its my laptop.
2) VisualBoyAdvance, I know uve listed the 2 emulators to play this, but ive already had VBA so i thought it would be fine. Maybe it was the emulator?

After the image im attaching it, i cant go back or do anything though the audio will continue normally. But itll turn black screen. Thank you again :)
Ooooh I get it, the problem is that VBA's emulation is not accurate enough, so your game might freeze or crash randomly. That's the main reason behind my recommendation.
You should use the latest version of mGBA instead.
 
Ooooh I get it, the problem is that VBA's emulation is not accurate enough, so your game might freeze or crash randomly. That's the main reason behind my recommendation.
You should use the latest version of mGBA instead.
Tried latest mGBA upon your reccomendation. Issue resolved and luckily it can read the save data so i dont need to play back from the start. Thank you !!!
 
Update time! Update time!
We're planning to release Beta 3.0 by the end of June/beginning of July, here's what we accomplished so far:

► FIFTH STRATUM: ABYSSAL SHRINE

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► BYE BYE, FREEZE! SAY HELLO TO FROSTBITE!

We can all agree that Freeze is a garbage status condition, so we decided to change it and use Frostbite instead.
Frostbite is a status condition from PLA. Similar to a burn, Frostbite inflicts damage equal to 1/16 of the target's maximum HP every turn. Pokémon with Magma Armor, as well as Ice-type Pokémon are immune to this status. You can't inflict Frostbite in harsh sunlight.
Frostbite will decrease the target's Special Attack by 50%.

► ETRIAN VARIANTS - SECOND WAVE SNEAK PEEK

This is just half of the second wave, so more forms are going to be added in the future.

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► BEFORE STARTING YOUR PLAYTHROUGH...

When starting a new game, you'll receive information about recommended emulators and what's going to happen if you don't use one of these.

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► GAME NOTIFICATIONS

You'll receive a notification whenever a Stratum is cleared, a level cap is increased etc etc

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So, I found a strange bug that happens when minun hit's level 10 and learns a move I think quick attack, and hitting yes bugs out and you see the delete move screen buuuut there are no moves or words hitting anything resets the game back to the starting screen.
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Same thing with Plusle
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