Well, assuming normal attacks may affect a ghost, I think its safe to go to your world...start off with a Dark World, now that Pikachu can't see well, now, use your Psychic powers to throw the rat into some sharp swords, finish the round, still not much vision, and fighting moves don't affect ghosts too bad, so Hypnosis the rat when it's close!!


Sigark World
Desc: Poltergeist snaps his fingers, and instantly he and his foes are transported to a darker version of the arena they were at, where Ghost type moves are boosted to doing twice their usual damage, and only Ghost and Dark types can see clearly.They will stay in this world until Poltergeist faints or is told to stop, however the strain of keeping this world up drains 2% health from Poltergeist per action it is up.It can only be used once, and will last for 2 rounds maximum on it's own, if Poltergeist is not told to stop, or faint. Type:Ghost |Accuracy:80% |Damage:2% to poltergeist per action |Effects: see above