have volcorna and orcorio out on your side of the battlefield than have volcorna use firey dance, and orcorio use tailwind, it's worth it in the long run, orcorio has the ability dancer , meaning it will use any move with the word dance in it when that move is used, volcorona could use firey dance, oponets could use other dances like Dragon dance or swords dance, and orcorios ability will make it use the dances, and the stat boosts stack, I beat a terastalized teraopagos that way