Entei is a legendary Fire type Pokémon, one of the Legendary Beast trio.
Locations
Pokémon Gold/Silver: It is roaming Johto.
Pokémon FireRed/LeafGreen: It is roaming Kanto.
Pokémon Colosseum: You snag him from Dakim at Mt. Battle.
In Super Smash Bros.
Entei appears in Super Smash Bros. Melee and Super Smash Bros. Brawl. It shoots a pillar of fire upwards. He is sent out by throwing a Pokéball, and one of the Pokémon that can come out is Entei, although its appearance is rare.
Trophy
A Volcano Pokémon. When Entei barks, a volcano erupts, and it's said that a new Entei is born every time a volcano appears. A proverb claims that the warmth of summer is created by Entei racing through the clouds. Entei uses Fire Spin, a flaming vortex that traps and damages foes for multiple turns. - Brawl