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Arcanine @ Leftovers
Trait: Flash Fire
Modest Nature (252 SAtk / 252 Spd / 4 HP)
- Flamethrower / Heat Wave (if you're into that...)
- Dragon Pulse
- Sunny Day
- Solarbeam
Exploitation of all good Special Attacks of Arcanine.
But you can also go MixArc:
Arcanine @ Leftovers
Trait: Flash Fire
Lonely Nature (Not yet sure on EVs.)
- Flamethrower / Heat Wave / Flare Blitz / Overheat / Fire Blast (in order of dependability)
- Thunder Fang
- Crunch / Dragon Pulse
- Reversal / Extremespeed
The purely physical set of Arc lacks the reliability of Earthquake, and Dig goes nowhere near that reliability, so I really prefer the Mix or the Special. Hidden Power [Ground] might be an order. Hidden Power [Grass] and a utility move like Agility could be placed instead of Sunny Day and Solarbeam. At least with Agility, you can remove some Spd EVs and put them on Def or HP so that he can live longer.