Metagross is appears in Super Smash Bros. Brawl as a Poké Ball Pokémon and uses Hammer Arm, which has effects similar to Venusaur's Earthquake.
When summoned, it slams its arm in the ground. Any opponent caught in the shockwave is buried in the ground and takes heavy damage. It struggles to grab the claw back out of the ground, before slamming another in. It repeats this several times.
The attack does not harm the user.
If Metagross is summoned on a soft platform, it will fall through it.
An Iron Leg Pokémon. When two Beldum combine, they evolve into a Metang. In the same way, a Metagross is the result of two Metang combining. It's said to have intelligence that can match a supercomputer. Though it weighs 1,212.5 pounds, it is somehow able to fold up its legs and float.