From the Super Mario Wiki
Battlefield (戦場, Senjō) is a recurring stage within the Super Smash Bros. series, appearing in every installment to date. 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 large floor platform and three smaller platforms hovering above it. The stage does not have any hazards, like Final Destination, which allows players to solely concentrate on the fight.
Super Smash Bros. Melee is the first stage to feature Battlefield as a selectable stage. It can be unlocked by completing All-Star mode on any difficulty. In addition, the Fighting Wire Frames as well as the metal enemies are battled on it.
In Super Smash Bros. Brawl, Battlefield returns as a default stage. The stage now takes a natural green landscape as opposed to space in the previous games. It also features a day and night system that changes the time of day as the battle goes on. The stage is once again the location where the Fighting Alloy Team is battled.
The Super Smash Bros. for Nintendo 3DS / Wii U variations of this stage take a lot from the design of the Super Smash Bros. Brawl version, as it is in a natural green landscape and features a day and night system that changes as the battle goes on, but the background has been improved slightly. The 3DS version's background consists of several jagged, slanted mountains jutting out from the clouds, while the Wii U version features several floating islands of old, broken architecture covered in small plant life, with a visible moon the center. The Final Destination variant of these stages consists of just the base platform.
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Trophy Information from Super Smash Bros. Melee