Since Rockruff might be one of the posterboys for Z-Moves, I have some ideas:

Sunruff
Rock
Ability: Boost the power of z moves even further
Ability: Tough Claws
Ability:Adaptability
Ability: Rockiate

Wereruff
Rock/Dark
Ability: Prankster
Ability:Gale Rocks
Ability:Gale Darkness
Ability:Counter still activates if it faints
Ability:Can Knock off Z-stones (and potentially mega stones)