Battleship Halberd is a stage in Super Smash Bros. Brawl that takes place on top of Meta Knight's airship, the Halberd. At the beginning of the battle, players fight in the ship's hangar, though once the actual battleship is ejected from the hangar, the platform they're fighting on will also do so and follow the ship for a short time. Occasionally, it'll land on the ship's deck, which will make the battle even more intense.
Once you land on the ship, a large cannon will shoot lasers toward you and your opponents and a mechanical arm will also attempt to cause harm. This ship also plays a big role in the Subspace Emissary.
In the Subspace Emissary, the ship is hijacked and is seen throughout. It was hijacked when Tabuu saw how it could benefit his army. Apparently during his attempt to take the ship, Meta Knight wanted to take it back, though at this time King Dedede was battling him, thus making it impossible. Meta Knight eventually gets his ship back after it defeats the Great Fox, and uses it against the Subspace Gunship, ultimately being destroyed by a large laser it shoots out. Following the Halberd's destruction, the characters within escape via a variety of arial vehicles and take on the gunship head-on.
The Halberd's trophy description in Super Smash Bros. Brawl:
Meta Knight's battleship, built to help Meta Knight take control of Dream Land. It's crewed by Meta Knight and the Meta-Knights and is equipped with the Combo Cannon and a shrimplike robot called the Heavy Lobster. Kirby destroys the ship's reactor, causing the Wheelies who power the ship to flee. In the end, the ship crashes into the sea while the sun sets in the background.
The Halberd is Meta Knight's ship from the Kirby series, first appearing in Kirby Super Star for the SNES. It's rather gigantic, and features Meta Knight's classic helmet (though overly super sized) on the front. In Super Star, it appeared in the mini game Revenge of Meta Knight. The ship is equipped with the Combo Cannon, which during the game would shoot down Kirby's warp star. In the end of the game the Halberd sinks in the Secret Sea, and is found once more in Kirby Squeak Squad in the background way down in the depths, where it is later raised by Meta Knight who takes it to the Gamble Galaxy, the final location in the game.