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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
Would have to predict toxics with this I guess since no toxic orb
Mega Sandslash
Covered in iron/ore patches around all round it's body from digging, and the spikes on its back become more jagged/rougher looking
Ground/Steel
Iron Barbs
75/100/110/45/55/65 -450
Mega: 75/120/165/25/130/35 - 550
Learns slack off via breeding
Mega Rapidash
Grows wings (maybe made of fire?) akin to a pegasus
65/100/70/80/80/105 -500
Mega: 65/130/90/90/105/120 -600
Fire/Fairy
Levitate
Learns Play Rough/some more fairy moves via breeding
Mega Tauros
Normal
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.
Reckless
75/100/95/40/70/110 -490
75/155/105/40/100/115 -590
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.
Mega Beedrill
Bug/Dark
Frenzy - When an opponent is KOed Attack and Speed raise one stage
Grows more menacing with slightly larger drills and a darker pallete resembling a bit more of a wasp than a bee
65/90/40/45/80/75 - 395
Mega: 65/120/95/45/100/112 -537
Unique new move: Stinger Rush - Bug Power: 100 Acc: 95 PP:10 May poison the target (20%)
New Move Tutor/Egg moves/Level Up: Block, Attack/Defend/Heal Order, More dark moves: Knock Off, Beat Up, Night Slash, Pursuit, Sucker Punch(Not actually a punch in JP), Taunt, Torment
Mega Beedrill is a biiiiiit OP, but I don't feel like fixing stats. Rest could be believable, rapidash tauros and weavile more so than the others I'd think.