Inflagetah Nature and EV Build

Hello Guys, so, i'm going to train a Inflagetah for my poke Team. So, what do u guys think about a Nature and EV Build for Him.
I was thinking about Adamant or Jolly Nature, and i'm in doubt of how would i distribute his EVs.
Even if i'm going to give him hight Speed and Atk Stat, he wouldn't die easily because of his low def and sp def?

Honestly I'd personally say that because of his ability you don't need to worry too much about his speed. He's fairly fragile to begin with, and anything looking at him funny is gonna kill, but with good priority moves and an ability that boosts them I'd say you should emphasize attack power and shore up your defenses a little bit, as speed falls by the wayside with the options it has available. Also, even with a nature that drops speed for example it's still going to be faster than most things.

and what is the effect of acceleration? hability

Increases damage of moves that have priority.

I would go adamant because it needs that attack boost more than the speed boost. As for the evs, probably go 252 Atk/252 Spd/6 Sp Def. Considering his ability of Acceleration (that gives 1.5x bonus to priority moves) and that you probably have ExtremeSpeed on him, it's possible that you could still use him against some water and maybe some ground types with low defense.

As redwolf was saying, you could move those evs from Spd to Sp. Def. and/or Defense to try and avoid being one-shot if you don't one-shot

Doesn't it also have a fire type priority move that's unique to this game? With that STAB and acceleration and high attack it's terrifying. If you can get it in such that you have a chance to set up at least one Swords Dance you're gonna wreck stuff, and then you can pack U-Turn for a nice damaging switch as well.

Yeah it has Flame Impact. The power is only 65 but STAB and Acceleration will make it about base 130 (65*1.5*1.5).

Actually more like 146.25 which is op.

Yeah, especially when considering it's accuracy is 100% too

anyone here know, how does the formula work for STAB and hability Damage? as for held item and everything else?

STAB is 1.5x damage for moves of the same type as the Pokémon, and I imagine most items give a 1.5x boost as well, but not 100% certain. Also what ability are we talking about here?

Acceleration is 1.5x damage for priority moves (ie. ExtremeSpeed)