The complete Pokemon Diamond and Pearl pokedex, part 9

Pokémon Name: Rotom
Type: Electric / Ghost
Classification: Plasma
Pokédex Number: 479 National
Ability: Levitate – Ground-type attacks always miss
Useful Attacks: Ominous Wind
Location Found:
D/P/P: TV in Old Chateau (Eterna Forest) at night
HG/SS: Trade with D/P/P
B/W: Route 15 - Trade NPC Ditto for Rotom

Rotom isa winsome electric ghost. Found haunting the television of the Old Chateau, Rotom can be exorcised and battled once you've beaten the Elite Four. Easily catchable, Rotom's unique type combination and its innate ability make it only weak to Dark-type attacks and completely immune to Normal and Fighting attacks. Rotom is genderless so it can only breed with Ditto, limiting its breedable moves. It can't learn many powerful moves, but its single weakness and immunities make up for its weak move pool.