You're always in the choice between this four:
Close Combat, Wild Charge, Crunch and Morning Sun.
Thing is, if you want to deal consistent damage at almost everything and get past Tyranitar and the like easy, this in the way, not being forced to switch and expose a teammate, you need Close Combat.
If you have a solid answer again Bulky Waters, drop Wild Charge, if not, keep it, same case with Ghost and Crunch.
But, if you don't have trouble with either Water, Flying or Ghost/Psychic type, go with Morning Sun, Arcanine is hitting, taking recoil and switching, if it can scare something, you can heal yourself and keep hitting with Flare Blitz.
This said, Arcanine it has little to no presence online since is hard walled and easily checked anyway. I'm saying this because I use one, and also like this Pokémon a lot. Arcanine isn't just cutting it.
The worse part is that Arcanine isn't cutting just by 5 Speed Base points.