Mega Froslass uses Snow Warning to trigger harsh snow on Mega Evolution. Ice/Ghost typing is immune to Normal and Fighting. Blizzard is 100% accurate in snow and hits both opponents. The only dedicated snow setter in the meta.
Why it's threatening
Snow Warning requires no setup turn — Mega Evolution itself activates it. Blizzard at 100% accuracy immediately pressures both opposing Pokémon. Ice-type defense boosts under snow make Ice-type teammates much harder to KO.
Fire, Rock, Steel, and Ghost moves all threaten Mega Froslass. Dark moves bypass Ghost immunity. Tyranitar's Sand Stream can overwrite snow. Targeting Froslass specifically before Mega Evolution prevents the weather from setting.
