From the Super Mario Wiki
Battlefield (戦場, Senjō) is a non-selectable stage in the game Super Smash Bros. It also appears in the sequel, Super Smash Bros. Melee as an unlockable stage, and appears as a stage in Super Smash Bros. Brawl. In Super Smash Bros. Melee, it could be unlocked by completing the All-Star mode.
The stage has been designed specially for the Super Smash Bros. series and does not originate from any other Nintendo franchise.
Battlefield is a floating stage consisting of a big platform in the middle and three smaller platforms hovering above it. The stage does not have any side effects, just like Final Destination, which allows players to solely concentrate on the fight.
In Super Smash Bros., Battlefield is the stage where the Fighting Polygons are battled. However, the stage cannot be played in VS Mode. In Super Smash Bros. Melee, the Fighting Wire Frames and metal enemies are battled on it.
In Super Smash Bros. Brawl, it is in a natural green landscape as opposed to space in the previous games. It features a day and night system that changes as the battle goes on.
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Trophy Information from Super Smash Bros. Melee