ITT: Create a Mega Evolution for a Pokemon that doesn't have one

Mega Milotic
Type: Water/Fairy (to contrast Mega Gyarados's Water/Dark)
Ability: Wonder Scale – If this Pokemon is inflicted with any status condition, it will restore 12.5% HP at the end of each turn.

HP: 95
Attack: 70
Defense: 109
Special Attack: 130
Special Defense: 155
Speed: 81
Total: 640