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Timid is better because Roserade will never use it's attack, but Naive can work if that's all you have.
Edit: What happens if a sleeping Choice Pokemon uses Sleep Talk and wakes up on the next turn? Can it then use the move Sleep Talk selected the previous turn?
Maybe...
Mightyena @ Toxic Orb
Protect
Dark Pulse
Hidden Power [Fighting]
Facade
Quick Feet
4 Atk / 252 SpA / 252 Spe
Rash
The only other special moves it gets are Shadow Ball and Hyper Beam.