Celebi

Description
Celebi is a grass-type imp that can travel through time. Celebi is known to appear only during times of peace and travels through time to give warning of terrible events that will occur in the future.

Celebi is a plot-relevant Pokémon that was added in version 4.0. Celebi appears in Celadon Gym, both as an ally Pokémon and as a foe.

Ally Celebi
The good Celebi first appears in the cutscene for Celadon Gym. It came from the future--one year after the events of the game--to help free its past self. Celebi knows the protagonist from an encounter in Johto, claiming that the region will also be saved by the main character, thus hinting at the Johto sequel. This Celebi helps you in the level by healing your Pokémon with Celebi's Heal. In Rocket Hideout it is shown to have returned to the future with the other Celebi.

Foe Celebi
The evil, mind-controlled Celebi is an enemy Pokémon in Celadon Gym. Like all the other Pokémon in the gym, it cannot be caught. It will attack your towers by using Solar Beam. If you see it coming, remove your Pokémon from the map until it is out of range as it is very powerful and difficult to defeat.

However, it is possible to defeat if you have either Charizard with Fire Blast, Butterfree or Venomoth with Bug Buzz, Victini with Fire Blast, or a Gengar with Shadow Ball (a Pokémon with Roar, Whirlwind, or Dragon Tail may help as well so you can get more hits off it). Perhaps the easiest way to defeat Celebi is by using a Pokémon that knows Perish Song. Attempting to defeat Celebi isn't recommended if you're trying to beat the level for the first time, as its Solar Beam can make most Pokémon faint in two to five hits.

Location

 * Celadon Gym: Cutscene, Boss (Uncatchable), Ally (Uncatchable).

Shiny

 * Shiny Celebi Mystery Gift Code: q9a13r44

Shadow

 * Shadow (on 5/23/13, Thursday) Mystery Gift Code: q9a13r44

Trivia

 * The Celebi Hoodie Avatar was availible via Mystery Gift in v4.0 to v4.2.
 * It is one of the few avatars (along with Haunter and Duskull) that doesn't have seperate versions for Boy and Girl.
 * Celebi was one of the available choices for Sam's Birthday Mystery Gift along with Jirachi, Victini, and Shaymin, but Victini was chosen.
 * Celebi's Heal shares the same animation as Aromatherapy.