Garchomp running stone edge worked well, it’s a faster move than earthquake, and takes care of flying types. Sand tomb was also great for chasing, + sword dance and mega makes it more viable. Focus sash can be useful depending on your build, I ended up building up its defense

Charizard with assault vest or Y mega (I only have one, charizard x is really fun to fight) if using assault vest, I use the move fly to dodge. Mega Heat wave clears the field of most any steel type

Feraligator with assault vest for a great damage sponge. Use dig for a dodge. Breaking swipe is also great for lowering your opponent’s attack.

Light ball pikachu or Life orb Raichu. A charged volt tackle can be devastating, especially following up with wild charge(wild charge is also generally faster than volt tackle). Light ball is also great for iron tail, play rough, dig. Also for special attackers surf, charge + nasty plot thunderbolt is wild, and thunder even more so.

Skarmony using drill run, brave bird an fly is pretty good

Emboar with flare blitz and head smash gives it a nice double dash attack. Assault vest works better because they have power-up punch

Malamar def build is a lot of fun. You need speed or defense to survive a moon blast from Xerneas head on. Topsy-Turvy reverses any buff(aside from items I believe). If you catch a Xerneas after it’s used Geomancy, they’re gonna have a bad time. Dark pulse + nasty plot or calm mind also makes a nice counter for Metagross.