The complete Pokemon Diamond and Pearl pokedex, part 6

Pokémon Name: Spiritomb
Type: Ghost / Dark
Classification: Imprisoned
Pokédex Number: 108 Sinnoh / 442 National
Ability: Pressure – Causes the enemy to use twice as many PP
Dream World ability: Infiltrator – Disables effects of opponent's Light Screen, Reflect and Safeguard moves
Useful Attacks: Dream Eater
Location Found:
D/P/P: Hallowed Tower (Route 209) after placing the Odd Keystone in the tower and talking to 32 other players in the Underground (you can talk to the same person over and over as long as you exit/re-enter the Underground or your Secret Base each time)
HG/SS: Pokewalker - Quiet Cave
B/W: Poke Transfer

Perhaps one of the least visually interesting Pokémon,Spiritomb nearly makes up for it with a strong move pool and a type combination that, like Sableye, has no weaknesses. ObtainingSpiritomb is quite an ordeal: after finding an Odd Keystone and throwing it into the Hallowed Tower, you much talk to 32 other peoples' characters in the Sinnoh Underground beforeSpiritomb will appear. Fortunately, this rare Pokémon can be duplicated through breeding.