Defeat or catch a wildChest FormGimmighoul (yields 10-777)
Interact with Roaming Form Gimmighoul in the overworld (yields 1-200)[1]
Transfer a Postcard from Pokémon GO (yields 50-100)
If the player already has 999 Gimmighoul Coins in their Bag, a Janitor in Medali will hold onto any additional coins the player collects. They can be received once the player has less than 999 coins. He will store up to 4294967295 (or 2^32-1) coins.[2]
In Pokémon GO, Gimmighoul Coins are used to evolve Gimmighoul into Gholdengo. Unlike other Evolution items, Gimmighoul Coins do not take up space in the player's Item Bag, and they cannot be discarded.
This item was originally called the ?????? Coin (Japanese: ??????コイン?????? Coin) prior to February 27, 2023. It first became available on November 5, 2022, immediately following Community Day Classic: Dratini, and a day before Gimmighoul's name was officially revealed.[3]
Effect
A player can evolve a Gimmighoul into Gholdengo if they have at least 999 Gimmighoul Coins in their Item Bag. Candy is not used for this Evolution, making Gimmighoul the only Pokémon in the game that evolves without Candy.
Prior to February 27, 2023, as the ?????? Coin, this item was categorized as a Key Item and served no purpose in-game. Collecting one from a golden PokéStop caused a Roaming FormGimmighoul to appear in the overworld, but it could not be caught until February 27, 2023.
Gimmighoul Coins first appeared in The Terapagos I Don't Know. One was first discovered by Ludlow, but was snatched from him almost immediately. Later, Roy collected a coin dropped by a Roaming FormGimmighoul and went on collecting coins after being manipulated by a Chest Form Gimmighoul, who then took the coins and left.
With the addition of the same Chest Form Gimmighoul to the wild Pokémon roster living aboard the Brave Olivine in HZ102 and, later, to Dot's team in HZ105, Gimmighoul Coins became a recurring item in the series. In HZ120, after it finally managed to gather 1,000 coins, Dot's Gimmighoul evolved into Gholdengo.
A Gimmighoul Coin first appeared in Raid! The Dark Crew Base!!, where Scarlet was revealed to be collecting them as part of her profession as a treasure hunter.