Give Altaria 252 Atk/4 SpD/252 Spe jolly to outspeed more stuff and 0 friendship to weaken opposing Dittos. Replace its body slam, cotton guard, and draco meteor with roost to heal, dragon dance to raise physical attack and speed and possibly sweep, and frustration for more power. Give Volcanion a choice specs for more damage. Replace its focus blast with sludge wave for more accuracy and fairy coverage. Give Scizor a leftovers to heal. Give Gliscor 244 HP/252 SpD/12 Spe careful for more bulk. Replace its fling and acrobatics with roost to heal and stealth rock to hurt stuff on the switch. Give Amoongus a black sludge to heal. Replace its stun spore and synthesis with giga drain and fire hidden power to actually be able to hit things while they're asleep. Give Cobalion a fightinium Z to break certain walls and 252 Atk/4 SpD/252 Spe jolly to take advantage of its stronger physical attack stat. Replace its calm mind, focus blast, and flash cannon with swords dance, close combat, and iron head to take advantage of its higher physical attack stat.
