Pokémon Yellow

This is a disassembly of Pokémon Yellow.

It builds the following rom:

• Pokemon Yellow (UE) [C][!].gbc md5: d9290db87b1f0a23b89f99ee4469e34b

To set up the repository, see INSTALL.md.

Development Optimizations

• add dedicated bank for Trainer Data
• Pokémon sprites can be in any bank
• optimize Mart inventory data
• remove unnecessary Japanese grammar checks
• remove unnecessary SaveTrainerName routine
• Trainer sprites can be in any bank

Included Bugfixes

• 100% Accuracy moves no longer accidentally have a 1/256 chance of missing
• breaking a substitute no longer negates effects of sacrificial moves
• correct Bide damage glitch
• correct Critical Hit ratio error
• correct dual-type damage misinformation
• correct Exp. All oversight
• correct Hyper Beam + Sleep move glitch
• correct invulnerability glitch
• correct Reflect/Light Screen stat overflow glitch
• correct Substitute ¼ HP glitch
• damage is cleared when Pokémon enter the field so Counter/Bide cannot bounce back damage from non-active Pokémon or a previous battle
• Defense cannot become 0 after stat scaling
• prevent evolutionary stone bypassing
• prevent HP recovery move failure
• prevent level-up learnset skipping
• prevent partial trapping move Mirror Move link battle glitch
• prevent Psywave desynchronization
• prevent Struggle bypassing
• reset Toxic counter with Rest
• revise BallFactor behaviour for Ultra Balls

Graphical Changes

• Black Belts now use a previously unused sprite, modified further based on the SpaceWorld demo
• custom overworld sprites, adapted from the SpaceWorld demo
• new overworld sprites, taken from the SpaceWorld demo, for: Bill, Burglars, female Swimmers, Poliwrath, and receptionists
• replaced other overworld sprites with those of the SpaceWorld demo

New Features

• caught indicator in wild battles
• item descriptions in Bag
• more easily activate field moves
• Trainer classes each have their own DVs
• replace Beauties on water routes with female Swimmers
• replace SGB border with a variation on that of the '97 Silver beta

Restored Content

• display Gym Leader names on Badges screen
• display Rival dialogue after losing a battle to him

Quality of Life Improvements

• changed Struggle to be ???-Type so nothing can be immune to it
• Focus Energy now uses a previously unused animation
• increase Pikachu's happiness upon healing
• turn to face opponent trainers who have noticed you
• user will now awaken from Rest three turns after it is used and can attack on the third

See also

• Disassembly of Pokémon Red/Blue
• Disassembly of Pokémon Gold
• Disassembly of Pokémon Crystal
• Disassembly of Pokémon Pinball
• Disassembly of Pokémon TCG
• Disassembly of Pokémon Ruby
• Disassembly of Pokémon Fire Red
• Disassembly of Pokémon Emerald
• Discord: pret
• irc: irc.freenode.net #pret