Quoted By:
Mega Regice:
>50+ to Sp. Attack
>the other 50 spread across
Ability: Ice Age
>Sets up an eternal hailstorm upon entrance, with effects similar to Desolate Land and Primordial Sea.
Mega Regirock:
>50+ to Attack
>the other 50 spread across
Ability: Stone Age
>Powers up Rock type moves 1.5x. Rock is also super-effective against itself. Affects all Pokemon on the field.
Mega Registeel:
>50+ to Defense
>the other 50 spread across
Ability: Iron Age
>Attack increases when hit by a super-effective move (Fighting, Fire, Ground).
All of these abilities will cancel eachother out in double or triple battles, rendering them completely useless.
I couldn't think of anything better for the Regi trio. I was trying to incorporate the Ice/Stone/Iron Age theme, but I failed in my opinion.
