AV Cosmoem 
Monsareeasy
manu 11

Monsareeasy

manu 11

Slowbro-mega as a counter
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Slowbro-Mega @ Rocky Helmet
Ability: Fur Coat
EVs: 248 HP / 252 Def / 8 SpA
Bold Nature
IVs: 0 Atk
- Whirlpool
- Slack Off
- Magic Coat
- Spore
In a similar way to Manu’s set, Slowbro walls aero pretty effectively (252 Atk Choice Band Aerodactyl-Mega Dragon Ascent vs. 248 HP / 252 Def Fur Coat Slowbro-Mega: 78-93 (19.8 - 23.6%)). Whirlpool is one of the few ways to trap it and stop it from wussing out whenever it’s threatened (8 SpA Slowbro-Mega Whirlpool vs. 0 HP / 4 SpD Aerodactyl-Mega: 102-120 (33.8 - 39.8%)). Then, feel free to spore or continue hitting it. Trick is annoying to deal with but you should still get the kill with whirlpool, and Rocky Helmet is run over lefties or goggles to avoid giving aero extra survivability while punishing it for attacking.
ripIdea is nice but trapping moves don't trap pokemon who have Shadow Tag so Aerodactyl-Mega can still leave even after whirlpool. Put Slowbronite and you got a good counter for sure as you check trick and it can't really damage you
It actually works, now that is surprising, my badrip
good to know though
edit: are you sure? tried it out in custom game and seemed to trap fine, and bulbapedia specifies ghosts can't be hit, no mention of stag
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