Pokemon Yellow Legacy - You Can FLY! Edition ROM

Pokemon Yellow Legacy – You Can FLY! Edition is a Game Boy ROM Hack by moosedude451 based on Pokemon Yellow. It was last updated on October 07, 2025.

Description

Pokemon Yellow Legacy: You Can FLY! Edition is a small, mini hack of TheSmithPlay’s incredible Yellow-enhancement hack – Yellow Legacy, which adds HM FLY to several Pokemon’s learnsets, with the guiding logic being that, if a Pidgey can fly with you, these Pokemon should be able to as well. While I feel Yellow Legacy does an amazing job fixing most of Gen 1’s problems.

I wanted to take things just a little bit further as one thing that bothered me even as a child about Gen 1/2 is that there are all these winged/ Flying-type Pokemon that for some reason can’t learn FLY, and thus felt a bit redundant/ pointless to add to your team. My hope is that this simple change will help make these Pokemon be much more useful and viable as long-term team members because you will no longer have to waste an additional team slot on another Pokemon to use as a “dedicated Flyer”.

New Features

Adds HM FLY to the following Pokémon learnsets

• Beedrill
• Butterfree
• Scyther
• Venomoth
• Dragonite, Zubat/ Golbat all received FLY as part of in vanilla Yellow Legacy

Yellow Legacy Features

Menus

• Ask to reuse Repels
• HMs can be used from the overworld
• HMs can be forgotten
  • To avoid softlocks, HMs cannot be stored in the PC
• Extended bag with more slots
  • Items can be sorted with Start
  • Items now have descriptions
• Party menu now shows StatEXP and DVs
  • Press Select/Start respectively when selecting STATS
• TM names are shown in menus
• Updated Pokedex functionality (See Encounters & Learnsets for more details)
  • Level-up and TM learnsets now displayed
  • Location menu now i

World & NPCs

• Running Shoes added
• Faster Nurse Joy
• Faster Saves
• Updated Marts to include TMs and other rare items
  • All TMs can now be repurchased
  • Use Left/Right to change items by 10 when buying or selling
• You can now obtain the Old Rod from an NPC in Viridian City Mart
  • The Old Rod’s original location has been replaced with the Good Rod
  • All rods now have improved encounter tables
• Game Corner Pokémon & TMs prices lowered
  • Coins can also be bought in bulk
• Enabled easier access to Fuchsia Pokécenter
• Surge’s Trash Puzzle no longer resets after every check
• Faster spinning tiles 
• A Move Reminder and Move Deleter have been added to Cinnabar Lab
• The Cerulean City Jynx trade has been re-added in Saffron City
• Miscellaneous dialogue changes have been made
  • Some story and character moments have been updated
  • Several NPCs now hint at gameplay changes

Visuals & Music

• Female character option for Green
• Pokémon Palette changes
• Various backsprite updates
• Unique Party Icons
• Overworld sprites for Pokémon and Gym Leaders
• Improved Battle UI
  • EXP bar
  • Already Caught icon
  • Full Box reminder Text after catch
  • EXP. All text shortens non-participants to “Party gained…”
• Seafoam Islands now uses a blue pallet
• Elite Four battles now use more fitting battle music
• A previously unused song in the game has been added to Viridian Gym
• The buttons in Victory Road now make a sound when pressed

General Bug Fixes

• Having a stack of 99 items and adding more can cause memory corruption
• A sign in Route 16 isn’t readable from the front
• A cuttable tree can return and block the player like it was never cut
• Trainers’ end battle text 2 isn’t read correctly
• The lucky slot machine in the Game Corner doesn’t stop when it should if you get a 7
• The lucky slot machine in the Game Corner doesn’t stop when it should if there are two 7s or BARs on the middle or bottom of the wheel
• The hidden 40-coin stash in the Game Corner only gives half
• It’s possible to get stuck in the wall when following Oak to his Lab
• Sliding of trainer and Pokémon graphics can cause tearing
• The lower-right tiles of Pokémon backsprites are deleted when sliding offscreen
• Trainer Card transition screens can show brief garbage on DMG
• Double Edge looks animation is bugged when the opponent uses it
• The battle victory music can sometimes play at the wrong time
• Prof. Oak’s lab music can sometimes play with a channel cut off
• The ‘acquired an item’ jingle can sometimes be cut off
• The audio engine may borrow from the high byte of the wrong frequency
• Articuno’s cry may get distorted when you see it in the binoculars on Route 15
• Fossils play their Pokémon’s cry when they shouldn’t in Pewter Museum
• The lucky slot machine in the Game Corner can be the nonexistent slot machine 255 (-1)
• CoordsData_6055e doesn’t have a proper ending terminator

Battle Changes

Here is a list of changes to the battle system, evolutions, and trainers. In addition there are links to various documents listed below for more details.

Battles & Difficulty

• Improved AI
• Dynamic scaling level teams for gyms 4-6 (Similar to Crystal Legacy gyms 5-7)
• Removed items from gym leaders and Elite 4
  • The only trainers who can still use items are Cooltrainers
• Hard mode: Forced Set mode, Items disabled in battle, Level caps by gym.
• Damage Over Time effects increased to 1/8 of max HP
• Most status moves are now neutral against all types (for AI)
• Removed boosted enemy chance to miss status moves
• Removed 1/256 chance to miss from normal mode
  • The chance is still present in Hard mode
• Removed catch requirement to acquire EXP. All
• Buffed efficacy of Rocks/Bait in the Safari Game
• Buffed efficacy of Safari and Ultra Balls

Pokemon, Types, & Moves

• TM04 Whirlwind has been changed to Flamethrower
  • TM04 Flamethrower replaces TM02 in the Rocket Hideout
  • TM02 Razor Wind has moved to Whirlwind’s old location on Route 4
• Alakazam and Gengar evolve at 42, and not by trade
• Golem and Machamp evolve at 38, and not by trade
• Poliwhirl evolves at 18
• Pikachu has been given extra boosts to extend its viability into late-game
  • Now receives 25% stat bonus from badge boosts (instead of the normal 12.5%)
  • Can now learn all 5 HMs (yes, this enables the Surf minigame)
• Ghost is now Special, and is super effective against Psychic.
• Bug is no longer super effective against Poison.
• Psywave now works the same for AI as it does for the player (Deals 75%-150% of level)

Battle System Bug Fixes

• Pokémon can skip learning moves when gaining multiple level ups at once
• Focus Energy quarters the critical hit chance instead of quadrupling it when used
• Substitute may leave the user with 0 HP after it’s used
• Dual-type move effectiveness may be misreported
• Fly and Dig do not remove the invulnerable status when prevented from reaching their second stage by Paralysis or Confusion triggering
• Healing moves will fail if max HP is 255 or 511 points higher than current HP
• Haze can prevent a Pokémon from attacking after curing freeze

Useful Links

Reddit

Documentation