Team building thread?

I'm building a new team and these are the ones I've got so far.
Granbull, Altaria, Lopunny (My mega), and Tyrantrum with Strong Jaw.

Is it possible to give Lopunny any ability besides Klutz, and what other Pokemon would balance out this team nicely? I do want a Grass-type, was thinking about Whimsicott or Sawsbuck.