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Mega Zangoose
Normal
Toxin Rage - Basically Toxic Boost +1 (Maybe +60% instead of +50% attack?), also nullifies poison damage
73/115/60/60/60/90 - 458
Mega: 73/135/95/60/80/115 - 558
Mega Sandslash
Ground/Steel
Iron Barbs
75/100/110/45/55/65 -450
Mega: 75/120/165/25/130/35 - 550
Learns slack off via breeding
Covered in iron/ore patches around all round it's body from digging, and the spikes on its back become more jagged/rougher looking
Mega Rapidash
Fire/Fairy
Levitate
65/100/70/80/80/105 -500
Mega: 65/130/90/90/105/120 -600
Grows wings (maybe made of fire?) akin to a pegasus. Learns Play Rough/some more fairy moves via breeding
Mega Tauros
Normal
Reckless
75/100/95/40/70/110 -490
75/155/105/40/100/115 -590
Horns become a bit bigger, it's fur mane grows a more tussled and grows over its body a bit more. Gets metal bands around the base of its legs right above the hooves.
Move tutor gives it Flare Blitz, Double-Edge, Head Smash and maybe more recoil moves.
Mega Weavile
Ice/Dark
Technician
70/120/65/45/85/125 -510
Mega: 70/150/100/60/100/130 -610
Maybe give it play rough? It has a lot of things to abuse technician with though, so it may not find a place on sets.