The complete Pokemon RSE pokedex, part 12

Pokémon Name: Beldum
Type: Steel/Psychic
Classification: Iron Ball Pokemon
Pokédex Number: 374
Ability: Clear Body
Dream World ability: Light Metal
Location Found:
D/P/P: Swarm in Route 228
HG/SS: Trade a Forretress for a Beldum with Steven Stone (post-National 'dex, at the Silph Co. building after talking to him at the Pewter Museum of Science), Safari Zone (Forest); Pokewalker - Winner's Path
B/W: Breed Metang or Metagross
Evolution: To Metang at level 20