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Better hp, recovery. (For fun: roost.)
Aditionally: a mega evolution that gives it a boost for special defense and a Dark typing, so it is an all around wall without weaknesses, while its non-mega has the niche to be switched into fairies and fighting types.
The best thing would actually be an evolution and then a poison/dark mega:
>regular weezing with eviolite and pain split due to the low hp
>evolution of weezing that fixes its hp and has better stats overall, used with recovery
>mega eveolution of the mega with a SpD boost and dark type for muh no weaknesses
But that'd be too much at once. So just Recover would be fine.
