Celebi

Celebi (, Celebi) is a creature in the franchise.

Origin
Celebi is a Psychic/Grass-type introduced in, and is categorized within the Pokédex at #251 as the "Time Travel Pokémon". It is depicted as the guardian of the forests and possesses the ability to travel through time, though this ability is shown in the main series Pokémon games only in a secret event in . Despite its DOJO!! description, Celebi cannot learn in any game. In the National Pokédex, it is registered as #251 and it is also the last Pokémon in the Johto Dex.

As a Poké Ball Pokémon
Celebi is very special among the Pokémon who can be summoned. First, it must be unlocked: it won't appear out of a Poké Ball until all playable characters and stages have been unlocked, the sound test has been unlocked, all event matches have been completed, and the Score Display feature has been unlocked (by getting 5000 total KOs). Once done, the chance of Celebi appearing is 1/251 ("251" being the total number of Pokémon in existence at the time of Melee's release), just like the other "unlockable" Pokémon, Mew. Both have their chance of appearing doubled in Event 37: Legendary Pokémon, making it a (still small) 2/251 chance.

Like Mew, Celebi's action is not an attack: Celebi gently flies off the screen a few seconds after it's summoned. Afterwards, the summoner is awarded the rare Celebi Catcher bonus for 8,000 Points. The first time this is achieved, it yields a special achievement message saying "You've encountered Celebi for the first time!" and awards the player the Celebi trophy.

Trophy
Celebi, as with all other Poké Ball Pokémon, features as a collectible trophy. The trophy is earned by encountering Celebi once during any match. This makes it one of the hardest trophies to earn because the player must play the majority of the game along with the small 1/251 chance.

As a Poké Ball Pokémon
It gracefully ascends to the sky while dropping off several trophies. Consider yourself lucky to meet this one! Celebi returns as a Poké Ball Pokémon in Super Smash Bros. Brawl. Its behavior remains the same, but instead of awarding a bonus it drops 3 trophies before flying away. After the player first sees Celebi, they will get a notice saying that they have seen it for the first time and "It is a rare event indeed".

Mew, Jirachi, and Celebi appear 1/493 of the time individually, with there being 493 Pokémon in, the latest Generation at the time of Brawl's release.

In
Celebi appears only as a trophy and exclusively in the 3DS version of Super Smash Bros. 4.

Spirit
Celebi also appears as a Legend-class support spirit.

In Adventure Mode: World of Light, Celebi is presumably one of the countless spirits captured by Galeem during his takeover of the universe. After Galeem's defeat, Dharkon takes control of Galeem's spirits, including Celebi. Celebi's spirit is located in the Sacred Land sub-dungeon of The Dark Realm.

Celebi's Spirit Battle uses a puppet fighter and is fought on the Garden of Hope stage's Battlefield form. During the battle, the stage is covered with fog. Also, the player's fighter takes minor damage while Mewtwo heals overtime, referencing Celebi's move, which drains the opponent's health every turn and restores the user's health.