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Saiyan, take a Whismur and name him Boombox.
This Whismur is perpetually exhausted (Probably because he lived in a cave filled with other, noisier Whismur)
He must keep himself awake by using only sound-based moves.
If he uses a non-sound-based move, he must be considered asleep and must switch out.

This all changes when Boombox learns both Rest and Sleep Talk. (Level 41 as a Whismur, 51 as a Loudred, and 55 as an Exploud)
Once he passes the aforementioned level, he can finally get some sleep!
He can now only directly attack through Sleep Talk.

He must solo three of Wallace's Pokémon.
Good luck!