100% IV Arcanine worth the stardust?

I got a perfect Arc as well. Mine was Fire Fang/Flamethrower. Since I use it for Attacking its basically same (stab vs higher energy generation) and it works well vs Grass/Lapras/Snorlax which is all I tend to use it for.

So le

Use for attacking, not defense.

That's a great moveset.

Bite is great for its EPS (which means you get your charge move much faster) and still has solid dps, with not much resisting its dark typing.

I evolved a 95.6% Arcanine and got Bite/Fire Blast and it's perfect. Flamethrower would work just as well, perhaps even better as dual bar moves tend to be more versatile, but I find a Bite + Fire charge move to be a great Exeggutor counter, as well as against other psychic types

Arcanine is generally more useful for attacking so I would wait to get an Arcanine with Fire Fang & Fire Blast (Bite is not bad bit I still prefer Fire Fang).

Arcanine are usually much better as attackers (They chew on anything that doesn't resist fire), but in this case It's probably better to use him as a defender, since Flamethrower is better as a defensive move than an offensive one, as it leaves you twice as vulnerable to attacks than Fire Blast does, also Bite as a quick attack works out allright, even if it doesn't get STAB, it get's arround type damage reduction from water and rock type mons like Vaporeon and Golem, plus it's super effective against Psychic type mons, like Starmie and Slowbro, plus his monstrous CP will have him sit pretty high on most gyms.

Try it vs Exeggutor, its awesome, flamethrower is good if Exe attacks u with confusion, u will have time to dodge everything after flamethrower.