Beldum, the Iron Ball Pokémon. Beldum floats by emitting magnetic waves from its body to repel the Earth’s magnetic field. They launch their claws into cliffs where they sleep.
– Ash’s Pokedex
Beldum cannot learn any moves by TM, HM, tutor, or breeding. In fact, it starts with Takedown, and that’s the only move it learns, until it evolves at level 20. Useless as it may seem, it evolves into Metagross, a pseudo-legendary.
Even though it’s the Iron Ball Pokemon, it doesn’t really look like an iron ball; only the head sorta looks like a ball.
Stat-wise, it’s got mostly Defense and Sp Defense.