All I've got is:
Mawile -> Twinwile
Houndoom -> Houndevil
Heracross -> Culestrong (Her"cules" + Strong)
Gyarados -> Shrikraken (shrimp + kraken)
Manectric -> Wolthor (Wolf+Thor)
All evolve via Level Up while holding a new item. Each Pokemon gets a BST buff of 50 instead of 100 but their abilities remain the same as the original Megas.
