Langarbaaz

Can anyone tell me how can I mega evolve my shiny absol mount?

I was fighting Lauriel like named a boss and i was about to setup my volcrona but in first move her ninetails alolan used Blizzard and my volcarona got frozen and than i used flamethrower but it doesn't melt it's freezing also my volcarona got stayed frozen for next 10-15 moves and u know I've used flamethrower soo many time but nothing happened and i simply lost . after that match i searched on official Pokemon website that how to unfreeze the Pokemon it says if i use flamethrower or any fire time move it will unfreeze it and also attacks it but in this worst game it's not happened lmao it's really is poopest thing in the game.

Already solved