@ blade: as i said arcanine is better all-around. it won't force switches, which are made bad by stealth rock. and arcanine can defend from sweepers and get past walls.
@ZLS: i would have thunderbolt, for double or multi battles.
also, how do you challenge frontier brains? idk how...
Arcanine is powerful for the UU tier, but not enough power for OU. What if Arcanine
were to receive the Stealth Rock damage? Bye-bye to 1/4 of your HP, which really reduces its longevity. His moveset is also very shallow despite having Flare Blitz and ExtremeSpeed.
Since the majority of Arcanine are built to be sweepers, there are no EVs put on defenses. So what if I bring out my Milotic? Even a Surf can damage Arcanine pretty badly, and since Milotic packs 252 Defense EVs, it can hold its own from a Thunder Fang pretty well.