Celebi

Celebi is a mythical Psychic/Grass-type Pokémon first appearing in Pokémon Gold and Silver Versions. Celebi is the guardian of Ilex Forest, and has the ability to travel through time. It appears as a Poké Ball Pokémon in both Super Smash Bros. Melee and Super Smash Bros. Brawl. In Super Smash Bros. Melee, Celebi can only appear if every character and stage has been unlocked, every event has been cleared, and the score display has been unlocked. It has a one in 251 chance of appearing, and if it does the player earns an extra 8,000 points at the end of the match. In Super Smash Bros. Brawl, it can appear at any point without needing to unlock it, and when it appears it drops a trophy before flying away; in this game it has a one in 493 chance of appearing.