Standard Unaware Suicune hard walls this. The standard TTar set inheriting from Mega Lucario or Crawdaunt looks much better.
I wanted Sucker Punch, and neither Crawdaunt nor Lucario gives that. It's supposed to be a late game cleaner, so Suicune should've been weakened / removed by teammates.
Inheriting from Xatu lets you get Magic Bounce (which is overall a better ability) and keep everything except Moonblast and Flamethrower. Inheriting from Clefable I can see if you hate Scald burns, though.
I underestimated Xatu's movepool - I forgot that it had Heat Wave and Dazzling Gleam, so yeah that would be better.
Actually, this is perfectly fine. Not sure how viable Trick Room is in the current meta, though.
Full Trick Room teams aren't very good, but individual users are fine. The only priority moves Mega Ampharos is weak to are Ice Shard and Refrigerate Extreme Speed, and Life Orb Mamoswine only has a tiny chance to 2HKO if hazards aren't down: 252 Atk Life Orb Mamoswine Ice Shard vs. 252 HP/4 Def Mega Ampharos: 164 - 195 (42.7 - 50.8%) -- 2% chance to 2HKO.
Camerupt @ Cameruptite
Ability: Synchronise
EVs: 252 HP / 4 Def / 252 SpA
IVs: 0 Spe
Quiet Nature
Trick Room
Fire Blast
Earth Power
Energy Ball / Thunderbolt
Inherits from Mew. 427 Special Attack, base 20 Speed and Sheer Force, in a Trick Room Mega Camerupt is lethal. Just make sure the Aqua Jet users are down first. Fire Blast and Earth Power get STAB and a Sheer Force boost. Energy Ball is used to hit bulky Water types hard. Thunderbolt could be used instead to hit the likes of Gyarados harder. If you've used Mew elsewhere, Dialga can also donate this set although you'll have to forgo Energy Ball.
Another set which I've found quite fun:
Landorus-Therian @ Lum Berry / Yache Berry / Life Orb
Ability: Aerilate
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature / Adamant Nature
Dragon Dance
Return
Earthquake
Stone Edge / Roost
Inherits from Mega Salamence. After Dragon Dance you outrun just about everything without a Choice Scarf. Thanks to Aerilate Return is a STAB move with 132 power. Earthquake hits the Rock, Steel and Electric types that resist it. Stone Edge OHKOes Zapdos at +1; Roost can be used to keep Landorus healthy.