We create broken Megas. I'm going to start with Kalos starters:

Mega Chesnaught
Grass/Fighting
Filter
88-88(+0)
107-137(+30)
122-142(+20)
74-74(+0)
75-125(+50)
64-64(+0)

Mega Delphox
Fire/Psychic
Sheer Force
72-72(+0)
69-69(+0)
75-105(+30)
114-164(+50)
100-100(+0)
104-124(+20)

Mega Greninja
Water/Dark
Protean
72-72(+0)
95-125(+30)
67-67(+0)
103-153(+50)
71-71(+0)
122-142(+20)