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Yellow hack: Pokémon Yellow Crossgen

TheRealEGR

TheRealEGR

  • Poké Ball
    • 10
    Posts
    3
    Years
    • he/him
    • Seen Apr 24, 2025
    Pokemon Yellow Crossgen
    Overwiew
    This is just your average Pokemon Yellow "enhancment" hack, but with a caveat: All the crossgen evolutions are implemented into the game, both preevolutions and evolutions.

    Features
    • Inclusion of crossgen evolutions for the Gen 1 Pokemon, from the Gen 2 ones till the Gen 9 ones. Note: This hack dosen´t add new types, so Steelix is Rock/Ground, Scizor is Bug/Flying, there is no Umbreon or Sylveon and Magnezone is pure Electric. This brings the total Pokedex number up to 183 species.
    • Implemented tradebacks for all the Pokemon and also raised their Special stats to their highest one, so Arcanine has 100 Special instead of 80, and Hitmonlee has 110 instead of 35, for example. This hack does not also implement new moves, but the current ones get wider distribution (still a WIP for the distributions) and get buffed to their best state, like Leech Life being buffed to base 80 and Thunder Wave being buffed with 100% accuracy.
    • Most sprites for the Pokemon have mostly been replaced with their Gen 2 styled variants, but with the colors of Gen 1. People might prefer the janky sprites of Gen 1 on a Gen 1 hack, but me personally, i just prefer the Gen 2 ones.
    • Made some trainers like the Gym Leaders, the rival and the Elite Four more difficult by adding better moves for their game time and more Pokemon on their team. This is still not a kaizo-like hack, with a casual team you can still beat it.
    • Added also some QOL functions (WIP, have to add more of them), like Pikachu being able to do the surf minigame.
    • (WIP) Added Pokemon events like Mew on the truck.
    Screenshots
    [PokeCommunity.com] Pokémon Yellow Crossgen[PokeCommunity.com] Pokémon Yellow Crossgen[PokeCommunity.com] Pokémon Yellow Crossgen[PokeCommunity.com] Pokémon Yellow Crossgen[PokeCommunity.com] Pokémon Yellow Crossgen[PokeCommunity.com] Pokémon Yellow Crossgen

    Credits
    • Me - for the Pokemon insertion and the movepool upgrades
    • pret - for the pokeyellow dissasembly and for helping me with some problems i had while making this hack on their Discord server
    • The people who worked at hacks like Polished Crystal and Red ++ - for the Pokemon sprites.
    Bugs
    • From what i found now in Public Release 1.1.1, none, i guess
    Download
    Patch file (you will need a Pokemon Yellow like this)
    • Pokemon Yellow (UE) [C][!].gbc sha1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1 CRC32:7d527d62 MD5:d9290db87b1f0a23b89f99ee4469e34b

    pokeyellow.ups

    drive.google.com drive.google.com

    Version changelog:

    Public Release 1:
    -First public release of the hack
    Public Release 1.1:
    -The moves that got buffed in LGPE also got buffed in this hack
    -Replaced the default battle for the E4 music for the gym leader one
    -Expanded the bag
    -Added item descriptions
    -Field moves (Cut, Surf) can be used like in Gen 2
    -Running shoes
    -Faster saving
    Side effect: This update breaks saves.
    Public Release 1.1.1:
    -Aka the emergency patch
    -This was intended to be 1.2, but since not all the 1.2 features were ready and there was lots of bugs, i decided to release this version.
    Bug Fixes and Miscelaneuous:
    -Fixed the Yellow Intro not working properly
    -Fixed Blue's sprite glitching out
    -Surf minigame now playable
    -Fixed the Safari Zone Encounters
    -Fixed Scyther's evolution into Kleavor
    -Edited some evolution methods
    -Best part: This is save compatible with Public Release 1.1
    New Stuff (intended for 1.2, forwaded for here)
    -Improved move information
    -Improved Pokedex, now it also shows it's base stats and what moves it can learn
    -Brought some sprites from pokeyellow-genII
     

    Attachments

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    Last edited:
    Stellarisk said:
    Thank you! I've been wanting a gen 1 QOL hack with Cross gen evos. Is there any chance of umbreon/sylveon coming in the future?
    Click to expand...
    I haven´t considered it, since i have no plans to add new types and i feel these mons i feel like they were made with their typings in mind (although i could make Umbreon a Poison type and Sylveon a Normal type, but that would be kinda weird)
     
    RickOfTheDarkness said:
    Since this was made with the disassembly I don't think it would work but... is this hack randomizable? Or at the least is there an easy to swap my started? I want to try out a different one or maybe do a solo run
    Click to expand...
    There is a way to swap the starter, you would need to change the STARTER_PIKACHU for the pokemon you want in scripts/OaksLab.asm (in full caps), but for that you would need the dissasembly and build the rom (it is on the Discord server). Also no, the universal Pokemon randomizer dosen´t work and other starter swapping tools like Challenge! only changes the mon Oak caught, the starter is still Pikachu.
     
    TheRealEGR said:
    There is a way to swap the starter, you would need to change the STARTER_PIKACHU for the pokemon you want in scripts/OaksLab.asm (in full caps), but for that you would need the dissasembly and build the rom (it is on the Discord server). Also no, the universal Pokemon randomizer dosen´t work and other starter swapping tools like Challenge! only changes the mon Oak caught, the starter is still Pikachu.
    Click to expand...
    Ohh thanks, I'll just do a regular playthrough then
     
    So I started playing through it and noticed that Struggle only does 1 damage to both the enemy and to your own pokémon. I decided to point it out since most people aren't likely to come across using Struggle in Yellow, unless they are grinding a Zubat like I'm doing lol

    Also, Misty says her winning dialogue even if you lose to her (the game then proceeds normally with the player blacking out, the only weird thing is the dialogue)
     
    Last edited:
    RickOfTheDarkness said:
    So I started playing through it and noticed that Struggle only does 1 damage to both the enemy and to your own pokémon. I decided to point it out since most people aren't likely to come across using Struggle in Yellow, unless they are grinding a Zubat like I'm doing lol

    Also, Misty says her winning dialogue even if you lose to her (the game then proceeds normally with the player blacking out, the only weird thing is the dialogue)
    Click to expand...
    On the Zubat part: It was intended that Struggle had 1 base power, maybe that´s why it deals only 1 damage, also i though it learnt Absorb instead of Leech Life, for beating the Geodudes or other Rock Pokemon.

    Also, on the Misty part: Lol, that was intended for the rival, but it seems the code also worked for the gym leaders, i have to also add winning dialogues for them.

    (P.S. Golbat evolves at level 38 to Crobat)
     
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