If you don't have a mega then I'd say Mega Sableye as Magic Bounce is LUDICROUSLY nice to have!
Also Sableye can work without a mega too so when a pokemon comes to ail Sableye BOOM! You Mega it and poison or whirlwind out the pokemon that was supposed to whirlwind YOU out!
Clefable can't bounce a whirlwind without sacrificing a valuable move slot.