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Pokémon Gold - All Glitches Fixed

Hack of Pokémon: Gold Version

Description:

This ROM hack removes every reported glitch from Pokemon [Gold / Silver](https://github.com/pret/pokegold/blob/master/docs/bugs_and_glitches.md) and [Crystal](https://github.com/pret/pokecrystal/blob/master/docs/bugs_and_glitches.md).

Specifically, this hack fixes:

  • Using the Coin Case can cause arbitrary code execution
  • Entering the Hall of Fame without a save file can corrupt the PC boxes
  • The Lucky Number Show does not find winning ID numbers in inactive boxes 10-14
  • Present’s text overflows when it fails to heal an enemy Pokémon with a long name
  • You can fish in the water in Cerulean Gym
  • “Route 15″ is not capitalized in a signpost
  • Multi-player battle engine

- Perish Song and Spikes can leave a Pokémon with 0 HP and not faint - Thick Club and Light Ball can make (Special) Attack wrap around above 1024 - Metal Powder can increase damage taken with boosted (Special) Defense - Reflect and Light Screen can make (Special) Defense wrap around above 1024 - Moves with a 100% secondary effect chance will not trigger it in 1/256 uses - Belly Drum sharply boosts Attack even with under 50% HP - Berserk Gene’s confusion lasts for 256 turns or the previous Pokémon’s confusion count - Confusion damage is affected by type-boosting items and Explosion/Self-Destruct doubling - Moves that lower Defense can do so after breaking a Substitute - Counter and Mirror Coat still work if the opponent uses an item - A Disabled but PP Up–enhanced move may not trigger Struggle - A Pokémon that fainted from Pursuit will have its old status condition when revived - Lock-On and Mind Reader don’t always bypass Fly and Dig - Beat Up can desynchronize link battles - Beat Up works incorrectly with only one Pokémon in the party - Beat Up may fail to raise Substitute - Beat Up may trigger King’s Rock even if it failed - Present damage is incorrect in link battles - Return and Frustration deal no damage when the user’s happiness is low or high, respectively - Dragon Scale, not Dragon Fang, boosts Dragon-type moves - Switching out or switching against a Pokémon with max HP below 4 freezes the game - Moves that do damage and increase your stats do not increase stats after a KO - HP bar animation is slow for high HP - HP bar animation off-by-one error for low HP

  • Single-player battle engine

- A Transformed Pokémon can use Sketch and learn otherwise unobtainable moves - Catching a Transformed Pokémon always catches a Ditto - Experience underflow for level 1 Pokémon with Medium-Slow growth rate - The Dude’s catching tutorial may crash if his Poké Ball can’t be used - BRN/PSN/PAR do not affect catch rate - Moon Ball does not boost catch rate - Love Ball boosts catch rate for the wrong gender - Fast Ball only boosts catch rate for three Pokémon - Heavy Ball uses wrong weight value for three Pokémon - Glacier Badge may not boost Special Defense depending on the value of Special Attack - “Smart” AI encourages Mean Look if its own Pokémon is badly poisoned - “Smart” AI discourages Conversion2 after the first turn - “Smart” AI does not encourage Solar Beam, Flame Wheel, or Moonlight during Sunny Day - AI does not discourage Future Sight when it’s already been used - AI makes a false assumption about `CheckTypeMatchup` - AI use of Full Heal or Full Restore does not cure Nightmare status - AI use of Full Heal does not cure confusion status - Wild Pokémon can always Teleport regardless of level difference - `RIVAL2` has lower DVs than `RIVAL1` - `HELD_CATCH_CHANCE` has no effect - Credits sequence changes move selection menu behavior

  • Game engine

- `LoadMetatiles` wraps around past 128 blocks - Surfing directly across a map connection does not load the new map - Swimming NPCs aren’t limited by their movement radius - Pokémon deposited in the Day-Care might lose experience

  • Graphics

- In-battle “`…`” ellipsis is too high - Two tiles in the `port` tileset are drawn incorrectly - The Ruins of Alph research center’s roof color at night looks wrong - A hatching Unown egg would not show the right letter - Using a Park Ball in non-Contest battles has a corrupt animation - Battle transitions fail to account for the enemy’s level - Some trainer NPCs have inconsistent overworld sprites

  • Audio

- Slot machine payout sound effects cut each other off - Team Rocket battle music is not used for Executives or Scientists - No bump noise if standing on tile `$3E` - Playing Entei’s Pokédex cry can distort Raikou’s and Suicune’s

  • Text

- Five-digit experience gain is printed incorrectly - Only the first three evolution entries can have Stone compatibility reported correctly - `EVOLVE_STAT` can break Stone compatibility reporting - A “HOF Master!” title for 200-Time Famers is defined but inaccessible

  • Scripted events

- Daisy’s grooming doesn’t always increase happiness - Magikarp in Lake of Rage are shorter, not longer - Magikarp length limits have a unit conversion error - Magikarp lengths can be miscalculated - `CheckOwnMon` only checks the first five letters of OT names - `CheckOwnMonAnywhere` does not check the Day-Care - The unused `phonecall` script command may crash

  • Internal engine routines

- `ScriptCall` can overflow `wScriptStack` and crash - `LoadSpriteGFX` does not limit the capacity of `UsedSprites` - `ChooseWildEncounter` doesn’t really validate the wild Pokémon species - `TryObjectEvent` arbitrary code execution - `ReadObjectEvents` overflows into `wObjectMasks` - `BattleAnimCmd_ClearObjs` only clears the first 6⅔ objects

ROM / ISO Information:

  • Database match: Pokemon - Gold Version (USA, Europe) (SGB Enhanced) (GB Compatible)
  • Database: No-Intro: Game Boy/Color (v. 20210227-015730)
  • File/ROM SHA-1: D8B8A3600A465308C9953DFA04F0081C05BDCB94
  • File/ROM CRC32: 6BDE3C3E

Links:

Screenshots:


Credits:

Credits
ContributorType of contributionListed credit
pretOriginal WorkDisassembling Pokemon Gold / Silver / Crystal and documenting bugs
splchHackingBuilding ASM

User Review Information

Awesome!

Reviewed By: gamingcat02261991 on 20 May 2022

This patch is super-impressive. Hopefully, there’s be glitch fixes for RBY soon, too (i.e.: fixing Rage and Focus Energy, etc.).

Version 1.0 Recommended - Yes

User Reviews
HeadlineAuthorDateVersionRecommend
Awesome!gamingcat0226199120 May 20221.0Yes