ITT: Give a underused Mon a Mega. Try to go with unconventional ideas that might make it viable. Feel free to add a couple of moves to it's movepool too. I'll start.

Mega Druddigon
Type: Dragon/Ice
Ability: Refrigerate

77
120 (+50) -> 170
90 (+40) -> 130
60
90 (+40) -> 130
48 (-30) -> 18

Inspiration: "It warms its body by absorbing sunlight with its wings. When its body temperature falls, it can no longer move."