Ive been using av snorlax with an ev spread of 252 atk/252def/4 sp def against timid mega zam. It can switch in on psychic or psyshock , take the focus blast and has a significant chance to ohko mega zam with crunch.
252 SpA Mega Alakazam Focus Blast vs. 0 HP / 4 SpD Assault Vest Snorlax: 202-238 (43.8 - 51.6%) -- 8.2% chance to 2HKO
252 SpA Mega Alakazam Psyshock vs. 0 HP / 252 Def Snorlax: 169-199 (36.6 - 43.1%) -- guaranteed 3HKO
252+ Atk Snorlax Crunch vs. 4 HP / 0 Def Mega Alakazam: 242-286 (96 - 113.4%) -- 75% chance to OHKO
Albeit, hes a shaky check since mega zam just needs to switch its nature to modest and lax is cleanly 2hko. It can check it still if you sac a poke to mega zam since lax cant switch in reliably.
So, alakazite def broken IMO and lucario is broken too. Lucario and daunt share many common traits. High attack, access to boosting moves and priority. Chesnaught was considered a counter to daunt then boom daunt ran aerial ace or ice beam, no more counter or check. Oh it can be revenge killed easily then boom you got an aqua jet to the face. But lucario can even go special and bypass its checks.
Lucario can beat gligar with ice punch, slowbro with crunch, faster threats with e speed, or it can go special wlith nasty plot. Tty revenge killing a poke that kos faster pokes with a +2 espeed.
Volc is more annoying, but more manageable. Between blissey av snorlax, scarf ape, fletchinder and sr, its pretty manageable. Oh and mega aero duh i forgot. Vooc is going to run essentially the same set with slight variance, but dedicated special walls can still wall it, but it can setup on umbreon and florges so easily though. So, not broken IMO.
Ape is annoying though. Not broken, but annoying nonetheless. Mixed LO and scarf are the more common sets. well see how ape progresses in this meta...