I don't know, but you could just use Snorlax (yawn) and Hipno (hypnosis) allternitly. If the opponent attacks first have some hyper potions or full restores ready.
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Dark hole, hypnosis, yawn, sleep powder.
There is no TM yawn. Only certain Pokemon can learn yawn/hypnosis/sleep powder/etc.
Hypnosis, Yawn, Dark Void, Sing, Spore, Sleep Powder, Lovely Kiss, Grasswhistle, and metronome
yawn
Unfortunatly, Yawn cannot be learned through a TM because no such TM exists. Moves that put enemies to sleep can only be learned by pokemon by leveling them up, or by breeding them in the Daycare center.