Wow! Classic arcanine! This guy is a hard core old testament phyaical attacker. Great moves!
Item: Leftovers/ Lum Berry/ Life Orb
EVs: 252 Attack 252 Speed 4 HP
Flare Blitz- STAB, plus a base power of 120 which is increased with STAB. If you don't like recoil, go with fire fang, or flamethrower if you're trusting it's special attack. Use leftovers for recoil, or go suicide with the life orb.
Extremespeed- You HAVE to teach this guy this. Priority + 80 base power = a must. Simple math.
Outrage: OK guys, this is outrage!!! You have to have it! It's just another move with 120 base power! Use the Lum Berry to snap it out of confusion.
Thunder Fang/ Close Combat/ Morning Sun/ Wild Charge- Ok I had a hard time deciding between these three so I listed them all. In my opinion, I would go with thunder fang or wild charge due to arcanine being ev trained on attack in speed so it is a partial glass cannon, so I think there would be no use trying to heal it with morning sun, but I know people are going to argue my point. Also, thunder fang or wild charge won't lower defense like close combat. As I said before, wild charge will due recoil, so go with leftovers if you choose this move.
So yeah that's about it. Please rate well! Btw this is my first set being posted so don't be too harsh. Until next time, See Ya!