Arcanine (Hisui)

Intimidate lowers opposing Attack on entry, shoring up Mega Froslass's fragile physical bulk against physical pressure. Extreme Speed provides Normal priority for finishing weakened faster targets. Flare Blitz delivers high Fire STAB damage. Rock Slide spreads chip and flinch. Chople Berry absorbs one Fighting hit. The Fighting weakness is a common threat against Arcanine. Adamant with significant Attack and Speed EVs maintains offensive relevance beyond pure Intimidate support. The Intimidate support shores up the team's main physical vulnerability. Without it, fast physical attackers can threaten Froslass before it applies offensive pressure through Blizzard and Shadow Ball.