Pokemon Peridot ROM

Pokemon Peridot is a GBC ROM Hack by Sea Tree based on Pokemon Crystal. It was last updated on August 27, 2026.

Description

Pokemon Peridot is a hack created using the pokecrystal disassembly project from pret. Taking place in a wholly original region, this release features 8 gym leaders and the Pokemon League, along with postgame rematches and a Battle Subway. This hack also features a selection of previously unused Pokemon designs from various points in Pokemon Gold & Silver’s development. These Pokemon were given fanmade stats to make up for the lack of finalized ones.

Features

General

• A brand-new region for the player to explore.
• Previously unused Pokemon from various points in Gold & Silver’s development. These feature fanmade names, stats, and typing.
• The player will have two rivals. Both will challenge the player to a battle periodically(Only one per character in this demo).
• Shiny Pokemon will have a Defense and Special DV of 15, the Attack DV calculation remains the same as regular Generation 2 games. Speed is not taken into account at all. This results in a 1/512 shiny chance.
• Borrowing from Pokemon Sun & Moon, certain routes will have a trainer that will refuse a challenge until every other trainer on that route is defeated.
• Move Tutors are scattered around the maps, sometimes in hidden areas. They will mostly teach moves that were exclusive to events in Gold & Silver.
• Every starter will be available through in-game trades.
• Prompt to use another repel when one runs out.

Gym Challenges

• Gyms cannot be exited until the player beats the leader or whites out. Losing will reset your progress in that gym. Bring healing items.
• Gym Leaders disallow the player from using any sort of items during battle. Berries and other held items will work as normal.
• Gyms can be completed out of order.
• Gym Leaders will have different parties depending on how much progress the player has made.

Battle

• There is no physical/special split. Dark was changed to be a physical type, and Ghost special.
• Added Fairy-type. It deals special damage.
• Some modern moves have been added.(See all move data.)
• Hyper Beam no longer requires a recharge turn if it knocks out the opponent.
• Teleport functions as it does in LGPE and Generation 8. The user switches out if in a trainer battle.
• Bonemerang is able to hit flying-type Pokemon.
• The Light Ball now doubles Raichu’s attack and special attack as well as Pikachu’s.
• The X items have been revamped. They are now a held item that activates when the holder comes out, like the Berserk Gene. They are consumed on use.

Pokemon

• Movepools and stats updated to reflect modern generations.
• Some inspiration has been drawn from the Spaceworld 97 demo for movepools. (Houndour can learn Bone Club, Mareep can learn Hypnosis)
• New items & effects.
• Pokemon that were previously trade evolutions have had their evolution method changed.
• Pokemon that required to hold an item and be traded will now evolve when leveled up while holding the designated item.
• Other trade evolutions will evolve at max happiness.
• Pokemon stats increased to match their current-generation counterparts.
• Some Pokemon given their old generation 1 special stats for balance
• TMs are infinite-use. They cannot be tossed or deposited into the PC.
• Most HM moves have been changed into TMs. The player can freely learn & forget these moves as necessary. Surf will remain as an HM.
• Some caves have walls that can be broken using Rock Smash to reveal secret passageways.

Misc.

• Update PC and Battle UI. The move selection menu will now show the base power of each move.
• The stat screen received an update to put the most relevant information up front.
• The map name’s sign will adopt the roof color of each map.
• Pocket Watch item allows the player to change DST settings from anywhere.
• The time is displayed in the corner of the screen after obtaining the Pocket Watch. (This can be disabled)
• Mystery Gift NPC that will give the player 3 random items per day.
• After the player receives the Fly TM, an NPC will appear in the basement of each Pokemon Center. This NPC will offer to teleport the player to any previously-visited landmark.

Changelog

V2.3.1

• Fix layout inconsistencies in Boreas Compound.
• Add wild encounters to Tidal Pass.
• Fix some mislabeled map events.
• Add an NPC that will sell the player Slowpoketail.
• The caught indicator on the Pokedex will no longer appear green if the player has not captured every Pokemon.
• The Pokedex may now search for types of Pokemon the player has seen, but not caught.
• Smart trainer AI will be discouraged from using Future Sight if their Pokemon is below 50% HP.
• Fix issue where opening the enemy’s stat display in battle would remove the player’s secondary type.
• Fix issue where Wilbur would move to an incorrect position after being moved too far off screen.
• Fix accuracy buffs of Glow Scales and Rock-type STAB to be applied properly. They will now provide a 10% accuracy increase.
• The Gorgeous Box will be awarded after completing 5 Pokemon League rematches.
• Wild Legendary Pokemon cannot be crit by moves and Pokemon with no boosted crit rate.
• Update some move descriptions.

V2.3.0

• Add continues to the Battle Subway. A continue is earned when the player is able to win a battle without a single Pokemon fainting. Continues can be used up if a battle is lost. They are lost after leaving a battle train.
• Using a Rare Candy on a level 100 Pokemon that can still evolve will trigger the evolution if the necessary requirements are met.
• Items that cannot be tossed can now be deposited into the PC.
• Change the Pokedex’s border color to green.
• Replace the type icons used in Pokedex entries with text-based ones.
• Change some Battle Subway NPC classes and names in order to prevent an overflowing text box when using certain moves.
• Fix issue where moves that boost multiple stats would play the animation and display failure text if a single stat became too high.
• Fix issue where a stat boosting move would fail if the calculated stat would exceed 999(it still caps at 999, but the stat levels will still increase).
• Fix issue where incorrect text would be displayed if Sharpen was used at +5 Attack.
• ???-type moves will now trigger Mirror Coat instead of Counter.
• Future Sight’s damage lowered to 100 power, and now plays an animation on its initial use.
• Runic Power’s damage lowered to 70 power.
• Fix issue where some tiles used for the battle transition would appear flipped in certain spots on the map.
• Adjust the color on some tiles to be better visible on an original GBC screen.
• Rearrange the Town Map’s landmark order to better convey the intended progression.

V2.2.3

• Change initialized box name length in an attempt to fix issue where Pokemon deposited into the box would disappear.
• The special Magikarp obtained in Ridge Village will now always be male.
• Pokemon caught in the Battle Simulation will no longer display an OT or trainer ID. The player will no longer be notified to nickname them.
• Running and biking through grass will now properly double the encounter rate.
• Long grass will have a doubled encounter rate over regular tall grass.
• Add some item pickups to areas 5 and 6 of the Safari Zone.
• Fix type names not being drawn in the move reminder and egg tutor if the move has perfect accuracy.
• Fix issue where Ferrodon had no egg moves.
• Fix the smash wall in Tidal Pass not breaking.

Known Bugs

• Currently, the player is not allowed to exit from the NPC Teleport screen. Allowing it provides buggy results.
• Hint text in one of the Unown chambers is awkward.

Useful Links

Discord

Pokecommunity

Documentation

Romhacking

Github