Bijed
International Regular
The only change in Sun & Moon that I can think of that affects fire-types as a whole is the halving of the damage dealt by the burn status effect.have they made fire pokemon like Arcanine any better in the current games
In Generation VI, when they introduced the new fairy type, they made it weak to fire moves which I guess counts as making fire-types better.
They have been increasing some of the stats of some older Pokémon, beginning in X & Y, which will have helped some fire-types.
Going back to Gen IV, Arcanine was helped by the split of moves into physical/special on an individual basis, rather than it just being type-dependent, but others will have lost out as a result of this.
Actually, I can't think when it happened, but when Groudon's ability stopped making permanent sun, that was a small nerf.