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

1. 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

• Database match: Pokemon - Silver Version (USA, Europe) (SGB Enhanced) (GB Compatible)
• Database: No-Intro: Game Boy/Color (v. 20210227-015730)
• File/ROM SHA-1: 49B163F7E57702BC939D642A18F591DE55D92DAE
• File/ROM CRC32: 8AD48636