The previous game, Super Smash Bros. Melee, featured Pokémon Stadium, but it's been upgraded for this game into Pokémon Stadium 2.
This time around, you'll see guest Pokémon appearing in the background.
Ordinarily, it's a fairly orthodox stage when nothing special is happening.
But as time passes, the terrain transforms into four different types:
"Electric", "Ground", "Flying" and "Ice." For these four transformations, we've chosen types that were not present in Melee.
Terrain that changes suddenly makes fights excitingly unpredictable.