jaraichi is the Pokemon on floor 99 of wish cave
Jirachi, the Wish Pokémon, is a third-generation, dual steel-psychic type, legendary Pokémon which is very elusive, but is sure to bring many victories and good luck to any trainer savvy enough to catch it. Unfortunately for all trainers out there who have the LeafGreen version of the game, it cannot be found on the wild anywhere in the game, and the only safe way to obtain it would be to assist to a special event held by Nintendo.