Pokémon Colosseum

Pokémon Colosseum, formerly known as Pokémon Stadium 3, is a starter stage in Super Smash Flash 2 coming from the Pokémon series. This stage's concept is similarly based off on Pokémon Stadium (from Super Smash Bros. Melee) and Pokémon Stadium 2 (from Super Smash Bros. Brawl), in the sense the stage can change into numerous forms based on Pokémon types.

Layout
This stage has one main platform and two small platforms on above the main platform. Depending on the image that's shown on the main screen, the stage will change it's layout. There is large screen that shows the Pokéball symbol. There is a crowd that is cheering. There are lights behind the screen moving back and fourth. There is a city that can be seen.

Music
The BGM is a remix of the Kanto Trainer Battle music from Pokémon Red and Green.

Origin
This stage is obviously inspired and modeled after the Pokémon Stadium stages that appear in Melee and Brawl. These stages were in turn based on the Pokémon Stadium games.

The origins of the stage's name stems from the game, Pokémon Colosseum, which could be considered the third game in the Pokémon Stadium series.