Download Pre-Patched Pokemon Odyssey GBA ROM Hack
- Creator: PacoScarso
- Version: 4.0
- Hack of: FireRed
- Updated: June 17, 2025
- Language: English
- Status: Completed (includes the full main story, the postgame, and all three unique endings)
Pokemon Odyssey is a GBA ROM Hack by PacoScarso based on Pokemon Fire Red in English. And it is now available to download. It was last updated on June 17, 2025.
Also, be sure to check out Pokemon The Fall of Heroes
Introduction
Hello people! Long story short: this is a crossover project between Pokémon, Made in Abyss, and Etrian Odyssey. It’s a sort of dungeon-crawler story-driven, but you don’t need to know anything about Etrian Odyssey or Made in Abyss to fully enjoy this game!
Synopsis
On the island of Talrega lies the entrance to the Yggdrasil labyrinth, a gigantic desert carved from the roots of the tree of life over millennia; filled with treasures and other valuable items, it attracted explorers from everywhere.
What are you looking for? Fame? Money? Or do you just want to test your coaching skills by tackling the maze? Is there something deep down?
In this game, you’ll play as Nyx, a young adventurer who wants to challenge the labyrinth.
But as soon as she starts descending, something goes wrong…
Narrative Arcs
- Strata 1-2 (v1.0) ➜ Part 1: Between the Azure Skies and Seas
- Strata 3-4 (v2.0) ➜ Part 2: What Lies in the Abyss
- Strata 5-6 (v3.0) ➜ Part 3: Truth, Despair and Hope
- Strata 7-8 (v4.0) ➜ Part 4: The Final Boundary
Features
- New Story and Region
- New Graphics (Sprites, Tilesets, etc)
- No Gym Leaders/Evil Team/Elite Four, it’s time to explore!
- Every Pokémon has been rebalanced
- New regional forms: the Etrian Variants!
- Shared Experience
- Two Initials Minun and Plusle.
- The first 3 generations of Pokémon and their 4th generation evolutions are available, as well as extras like Farigiraf.
- All Pokémon present received a new learnpool and the weakest mediums received buffs and adjustments to bring them to the level of the others
- 3 selectable game modes are available in the prologue: Picnic, Normal, and Hard
- Presence of Etrian Odyssey features such as Mining and Gathering points, Naval Exploration, FOE, and Store Upgrades
- Sidequests and a sidequest menu
- Wonder Trade
- All Pokémon, both trainer and wild, will have 31 IVs in all stats to decrease the grind
- You get no EVS from beating a Pokémon, instead you’ll have to use Power Items or Vitamins (for a lowered price)
- You can change the nature and the ability of your Pokémon using in-game functions
- The labyrinth is divided into layers and each of them has a captain that must be defeated if you want to continue
- Adding part of the movements of subsequent generations
- Pokémon nature is highlighted in the various menus
- EVs-IVs screen available in the Start menu
- The automatic stroke can be activated and deactivated by pressing the “L” key on the GBA Emulator
- All fights in the game will be doubles, except when you have only one Pokémon
- Pokemon will not give EVs when defeated. Indeed, it will be necessary to use vigor tools and vitamins (from the reduced price)
- There is a soft level cap to prevent players from making me too much and ruining the gaming experience
- Cannot use healing tools in combat unless held (like berries)
- There is a Prodigious Exchange system in the Talrega guild
- Exp. Share Gen VI style as a game mechanic
- Infinite TMs
- New soundtrack.
Characters
NYX
- A young adventurer that wants to challenge the Yggdrasil Labyrinth.
- Good at Pokémon battles, she tries to follow in her sister’s footsteps in order to surpass her.
- Signature Pokémon: Plusle & Minun
AIMÉE
- The best explorer from the Adventurers Guild in the city of Talrega and Nyx’s older sister.
- She’s the one that wrote the majority of books and guides regarding the labyrinth, its treasures and mysteries.
- Signature Pokémon: ???
ETHAN
- An introverted and awkward boy who will travel with Nyx during her adventure.
- He has a mysterious connection with Aimée.
- Signature Pokémon: Kecleon & Shroomish.
OLYMPIA
- A strange girl who will travel with Nyx during her adventure.
- She claims to be a robot and acts like one.
- She has a mysterious connection with Aimée.
- Signature Pokémon: Mawile & Porygon
Supported Emulators
- PC/MacOS: mGBA, VBA, VBA-M;
- Android: MyBoy, PizzaBoy, Retroarch (mGBA core), Lemuroid;
- iOS: 44VBA, Retroarch (mGBA core).
Save File Compatibility
Q: Are save files compatible between versions?
A: Yes, they are! To use your old save file with a new version, just make sure that both the .gba file and the .sav file have the same name (for example, Odyssey.gba and Odyssey.sav) and are placed in the same folder. The emulator will do the rest and load your save file.
If you’re having trouble with your save files after updating the ROM, follow these steps carefully:
- Save in-game using the in-game menu, then close your game.
- Do not use save states when switching ROMs—this can cause problems and is not supported.
- Find your old ROM file (e.g., Odyssey.gba).
- Move it to a different folder to avoid filename conflicts.
- Get the new ROM file (e.g., by patching as explained in your setup guide).
- Move the new ROM file to the same folder where your old ROM was originally.
- Rename the new ROM to match the exact filename of the old ROM.
- Open the new ROM in your emulator.
- Your emulator should now load the old .sav save file with your updated ROM.
Following these steps ensures that your old save data works with the new version of the ROM.
WARNING
Be sure to save at the Guild before applying this update!
Changelog – What’s NEW!
4.0.1
- Fixed some dialogues,
- Fixed some movement permissions,
- Fixed a bug regarding the Lavender Town ghost encounter in the 8th Stratum,
- Fixed an issue in Jagged Mountain,
- Fixed an issue with the Dex not showing the wild mons in the Sandy Caves,
- Fixed an issue that was preventing Vulpix from appearing in the wonder trade,
- Fixed an issue with Octazooka and Needle Arm’s priority,
- Fixed an issue with Call: Owl’s effect,
- Removed the double confirmation from MementoVitae
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Screenshots









Useful Stuff
Downloads
Previous Versions
Credits
- PacoScarso ➜ Creator
- Magiscarf ➜ Tilesets
- Aveontrainer ➜ Battle Backgrounds
- The-Red-eX ➜ Tilesets
- Ekat ➜ Tilesets
- Pyvetal ➜ Tilesets
- Aloeva ➜ Regional variants’ concept art
- Mediko ➜ Regional variant’ concept art and sprite
- Swonkfish ➜ Pixel art, regional variants’ sprite
- kWharever ➜ Battle Backgrounds
- BadassBill ➜ Tilesets
- Kyledove ➜ Tilesets
- Kalarie ➜ Sprites (OW)
- shinyzura ➜ Improved trainer sprites
- Avon, SphericalIce, DoesntKnowHowToPlay, FBI, Daniils, Squeetz, Jambo51, VersekrDark ➜ Asm
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.
fun! ♥♥♥
Update again 4.1
There’s a new patch/update, version 4.0.1 came out yesterday, fixed bugs and glitches found in version 4.0.0
New update is out! <3
updated it
Hey guyz … I just wanna know that , In Main Character : why isn’t there a Male character?
The final update is here
updated it
New update will come in exact 24 hours!!!
The final version has been released!!!
updated the post
Hey admin! This game got an update.
This seems interesting, i wouldn’t mind playing it when the game is fully completed
The game will be finished in February 2025 with v4.0 – “The Final Boundary” says the creator.
This has not happened.
new update out 3.5.4
3.5.3 is out
v3.5 has been released btw, could you please upload the new game titlescreen and screenshots? The ones you’re using now don’t reflect the actual state of the game.
Oh, you have to change the docs link too!
updated it
New update v3.5
3.5 update is live now
Beta 3.0 released today.
updated it
👍
waiting for the final update 🧘🏻♀️
Pokemon Pinball Generations recently received a new update, version 1.3, seen on RainbowDevs Twitter. Please update that post when possible too?
There is a new version available, beta v2.5. Please Update
updated the post
It’s not
only the text at the top of the post hasn’t been changed from v2.0.3 to v2.5 the links had been updated.
Completed the 50 percent wanna know when the next part is coming out
Where can we report found bugs etc? I’ve found that defeating a F.O.E. has a 50/50 chance of freezing the game after the battle (I play on the ‘My Boy! Free’ emulator for Android for relevance) and today I found out Lairon doesn’t learn a new move at level 35. Other than that the game has been great and quite refreshing from the regular Pokémon style.
If you want to report something use our Discord Server.
Anyway, that bug happens because you’re playing on MyBoy, which is not a supported emulator, but of course when they reupload my game they forgot to add or look at the txt files in the game folder
Documents fail to open..
Stats, wild encounters etc
fixed the links
I can’t open the map or use the bag during a match, any idea?
Unfortunately you’re using a bad emulator. Use mGBA on pc and Lemuroid/Retroarch on mobile
If you want to report something use our Discord Server.
Anyway, that bug happens because you’re playing on MyBoy, which is not a supported emulator, but of course when they reupload my game they forgot to add or look at the txt files in the game folder
I loce the game really do wondor when will the next update will be
New version Beta 2.0.2 is now available.
updated it
Beta 2.0.3 was released this morning.
updated it
Hey not working still. Kinda stuck with My boy and limited memory…disadvantage of a cheap phone lol. Still thanks again for the games tho.
Beta 2.0 is out now.
updated it
Ok good job but now I got an invalid GBA file. Not sure what went wrong.
I just checked the file and it seems to be working fine. Please re-download the game. If that doesn’t fix it, try using mGBA (if you’re on pc) or RetroArch with mGBA core/Lemuroid (if you’re on android)
Didn’t this get an update recently?
v1.6 seems to be the latest version according to their pokecommunity thread
K SK just checking…. I pay attention… tryna ng to keep my word up and keep you on fresh stuff buddy 😜
Thanks
qualcuno sa fra quanto arriva la versione italiana della 1.6?.
Ajoo e spacciati a fate la versione completa
Hi, any news?
Ciao, qualche news su a che punto è lo sviluppo?
no
english was released pokemon odyssey but i want to have it from pokeharbor.com just because
Aye! 🙌 btw yesterday someone told me that an english version was released so I’ve added that to the post too
I will say this, please keep me informed of when it goes to english, i love etrian odyssey and pokemon so this hack sounds like fun.
Right now.
Pls update to full version
v2.0.3 is the latest version
Don’t you have English
it has not been translated into English as of yet
The translated version has come out would be nice if u update ^ _^
thanks for letting me know I’ve updated the post
it’s not in english if you’re thinking about playing this
great i was gonna play it
It IS in English. IDK what they’re talking about
The original comment was made a year ago, this didn’t have an English version at that time.