Entei is treated as a "legendary" Poké Ball Pokémon; its chance of appearing is much rarer than most of the others, and in return its effect is more powerful. Entei uses Fire Spin as its attack. A column of fire will surround Entei's body when it executes this attack. Any character caught in the column of fire, excluding the summoner, will take damage, usually more than 70%. The character is also forced towards the top of the screen when he/she gets caught in the column of fire.
The Pokémon Stadium 2 model for Entei, massively enlarged, serves as a unique stage played only during the Event match Trophy Tussle 2. Therefore, it is not available for multiplayer play without hacking. The reward for completing the match will be the Entei trophy.
Entei features as a collectible trophy, unlocked when you beat the Event match Trophy Tussle 2 for the first time:
A volcanic Fire-type, Entei is hotter than liquid magma and as tough as nails. This powerful creature was one of the three Pokemon running around the Burned Tower of Ecruteak City. Entei is extremely difficult to seek out and capture, as it tends to wander all over the landscape, sprouting intense flames from its body. (Pokemon Gold & Silver 10/00)
Entei reprises its role from Super Smash Bros. Melee in Super Smash Bros. Brawl. The attack used is Fire Spin, as stated on the official Website. Entei's entrance is much more intense than what it was in Melee as it roars and stands on its hind legs before executing its attack.
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.