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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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Anyway, I've released v3.5.2 to fix some bugs:
  • Fixed a weird glitch regarding Nyx's overworld sprite.
  • Fixed some crash issues with chests on myBoy.
 
Version 3.5.4 is out! This will be the final hotfix before version 4.0 (GOD I HOPE SO).

Changelog:

  • Fixed some movement permissions in the 5th Stratum
  • Fixed some typos
  • Fixed a bug causing some... weird interactions during battle (I don't want to talk about this )
  • Barboach/Whiscash: Unaware -> Swift Swim
  • Sunkern/Sunflora: Added Chloropyll to its secondary ability slot
  • Slightly improved Regice's backsprite (I'll probably make a better one for the final release)

Last but not least, if you check ⁠the first post you'll notice I've added a 4th document regarding teambuilding. This will help the ones that aren't familiar with double battles and the competitive side of Pokémon. Said document will be expanded and upgraded later on.
 
Update time! Update time!

Happy new year!
Two months without any updates? Let's fix that.


► ETRIAN VARIANTS - FOURTH WAVE

The third wave has been added in v3.5, and since we had a lot of ideas we decided to add a fourth and final wave of variant in v4.0.
Here's a sneak peek of the first half:

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► NEW MOVES AND ABILITIES

Let's spice up the game even more, shall we?

  1. Gardevoir's new sprite, as well as new ability and moves:
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  2. Damage boosting abilities:
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  3. We've added Sand Rush, Slush Rush and Prankster, as well as a new ability for Blissey:
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► NEW SPRITES FOR NYX AND ETHAN

It had to be done.
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► EXTRAS
  • I've sped up the exp message during battle.
  • I've finished mapping the entire game

That's all for today. We'll probably release the final version by the end of February/Beginning of March, so stay tuned!
 
Update time! Update time!

SO

Ehm, as you've probably noticed, the final update has been pushed to the end of April—a date that's still not set in stone, as I have no clue how long it will actually take. Plus, real-life commitments come first, for obvious reasons.

That said, it doesn't mean I've been sitting around doing nothing—FAR FROM IT! I've got some exciting updates to share with you right away.


► REVAMPED START MENU

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Huge thanks to Ansh for the C-injection and to Avon for assisting with the customization.
There's not much to add—it's purely aesthetic.


► BETTER NAVAL EXPLORATIONS!

I'll keep it short: many people requested fast travel to and from the secondary islands.
So here we are—enjoy!

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► GEOMAGNETIC POLE

New sprite and UI

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► BETTER WONDER TRADES!

The trade system was a bit too random, so now you can choose which region you want to receive your Pokémon from.
Each region will have a pool of 20 Pokémon available for you to obtain.

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► ETRIAN VARIANTS

In version 4.0, there will be a total of 100!
Here's a sneak peek at the variants revealed so far—many sprites have been improved!

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► NEW ABILITIES

Here are some highlights from the new version!

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And that's a wrap for this month! See you next month—or whenever the game drops!
 
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Just curious: how is the progress for this game? Do you have any idea when it will be done because I can’t wait!
 
Just curious: how is the progress for this game? Do you have any idea when it will be done because I can’t wait!
Here's the current roadmap!

▬ MAPS ▬
✅ Seventh Stratum (Porcelain Forest) - 100%
✅ Eighth Stratum (Cyclopean Haunt) - 100%
✅ Postgame maps - 100%

▬ GRAPHICS ▬
✅ Firstpersonview sprites - 100%
✅ Overworld sprites - 100%
✅ Battle sprites - 100%
✅ Etrian Variants (Third Wave) - 100%
✅ Etrian Variants (Fourth Wave) - 100%

▬ EVENTS ▬
❌ Seventh Stratum - Main events - 80%
✅ Seventh Stratum - Secondary dialogues - 100%
❌ Eighth Stratum - Main events - 0%
✅ Eighth Stratum - Secondary dialogues - 100%
❌ Postgame events & true ending - 0%
 
this game looks absolutely amazing, LOVE etrian odyssey and the fact that it merges both it and pokemon is next level. will try out asap!
 
LET"S GOOOOOOOO I just cleared the Sixth Stratum. I am a very story-oriented player and this is the craziest and most enjoyable story I've experienced in a ROM Hack in recent memory. Very excited to see what happens in the last stretch 😆.
 
Opening 4.0 this morning to find out my Breloom I've had since the First Stratum became Poison-Fighting. Guess letting my save file sit for two months made it expire. 🤣 All seriousness though, cool redesign. 👏
 
Heya, Paco. Finished the game, and lemme say this: I LOVED it. The regional forms, the story, the endings, ALL OF IT. I got emotional so many times I've lost count. And what a niche continuation to the true ending I saw
AKA Nyx and Ethan settling down, founding a village, and having a kid of their own
 
hey i was wondering how you get evs in this game cuz i want to play hard mode but it really unfair rn as i don't get evs
 
hey i was wondering how you get evs in this game cuz i want to play hard mode but it really unfair rn as i don't get evs
There's a guy in Talrega (the second house you see when you enter the place) who'll give you a side quest in which after completing it, he'll give you an item that'll allow you to change EVs
Spoiler alert: it ain't cheap
 
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Beat the game! (Not fully, still got the true ending stuff to do) but omg Game Freak Pokemon has never made me feel like crying so much. I love the story and felt so invested in every minute of it! I very much look forward to Cassian's top tier memes. 🤣👏 12/10 bordering on 13


 
NEW VERSION AVAILABLE (v4.0.2)
  • Fixed some dialogues;
  • Fixed some random freeze instances and glitches after beating some trainers;
  • Removed the Friendship-increasing berry shop at the guild. Now there's a NPC that increases the friendship of your mons to its max value;
  • Fixed a bug that was preventing Leafeon, Glaceon and Yggdreon to be registered in the Dex. It's not retroactive, so you'll have to evolve them again;
  • Added "Lullaby" to the sound moves list;
  • Added "Expert Belt" on Faraway Island;
  • You can now register unobtainable mons in the Dex:
    B.B. Mawile & B.B. Kecleon -> Read Silva's notes in his Lab in Etria during the postgame.
    Lords of the Sea -> Read Napier's notes in her shop in Aqua Resort
  • Jigglypuff and Wigglytuff now learn Rotten Egg at level 10 and Lullaby at level 30 (Lullaby was too strong during early game);
  • The key item "Quest Log" has been renamed to "Story Log";
  • Mawile has been buffed:
    • HP: 60 -> 80,
    • Speed: 50 -> 60,
  • Shift Gear has been added to Mawile's learnset;
  • Camerupt has been rebalanced:
    • HP: 80 -> 90,
    • Atk: 100 -> 80,
    • Speed: 50 -> 60,
  • Slaking has been nerfed:
    • HP: 150 -> 140,
    • Atk: 140 -> 120,
    • Def: 100 -> 90,
  • "Call: Allies" BP has been nerfed: 70 -> 50;
  • Replaced Spearow and Fearow's Defiant with Rock Head;
  • New sprites for Spearow, Fearow and Feraligatr (credits to Lodestar195)
 
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