how sad that i know this... Sleep powder... http://bulbapedia.bulbagarden.net/wiki/Sleep_Powder_(move) Actually there is two- spore with it 100 accuracy and sleep powder with 55 I think. Only shroomish in platinbum can learn spore though.
spore
The move Dark Void puts its opponents to sleep however in a double battle it'll put both of its opponents to sleep.
grass whistle
Spore is a move that puts Pokemon to sleep and ends with the letter E.
hypnosys and snore in three turns also insomnia and vital spirit are abilitys that prevent sleep
There are a couple moves such as, sleep powder, grass whistle, sing, yawn, and one other move that I can't think of right now.
Spore!!! the move is spore
sing grass wistle sleep powder
hypnosis
the move hypnosis
technically its his ultimate move where he puts his opponents in a pot and cooks them
use sing :P