Fire type is very good against steel and fire types, please come to me if you have any more questions about Pokemon types.
Fire type is indeed very good vs steel and also vs grass, ice and bug type Pokemon.
It can win against fighting, electric, poison, flying, dark, ghost and normal-type Pokemon.
It is not very good vs pure rock, water, dragon or fire-type Pokemon (it only does half the damage vs fire-type, which is good defensively, but not offensively).
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A Fire-type Pokemon can deal 2x the damage to Grass, Ice, Bug, and Steel-type Pokemon.
fighting, fire, and rock.
Any fire type pokemon, or a pokemon with a fire type move, I think poison too...
Fire type has the very strongest advantage over Grass type Pokemon
Use dark or fire type moves.