Saffron City

Saffron City is an unlockable stage in Super Smash Flash 2 that hails from the Pokémon series, specifically the first entry in the series Pokémon Red and  Blue. It was revealed on one of the Beta Content Creator Program's videos and can be unlocked by clearing Classic mode with both and  on any difficulty.

Layout
Exactly like in Super Smash Bros., Saffron City has one main platform attached to a small platform above a door. To the right is a narrow platform and to the left are two elevators (moving platforms). Between these and slightly lower than the other platforms is yet another narrow platform. There are many gaps in-between that character and items can fall into, similarily to Fourside. So far, no Pokémon have been seen on the stage as a hazard, and the moving platforms are absent.

Origin
In Pokémon Red and Blue, Saffron City is the largest city in the Kanto region, and one of the most pivotal to the game. It is initially blocked off from all sides until a certain amount of progress is made. However, once allowed inside, it contains important locations such as the Silph Co. office building; the site of the main conflict against Team Rocket.

The specific designs of the buildings are a product of artistic license and, in fact, were rendered inconsistent with canon several years after its Super Smash Bros. appearance in Pokémon FireRed and LeafGreen.

Trivia

 * Saffron City and Silph Co. are the only two separate stages that are in the same location as each other.