you cant catch haxorus in the game but you can train an axew to evolve into a fraxure then a haxorus
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he learns it at level 66
It evolves into Haxorus at level 48.
Haxorus is only Dragon type, and as with all Dragon type Pokemon it's weaknesses are Ice and Dragon. I would recommend not using a Dragon type Pokemon though because you leave yourself open to high damage from Haxorus' own dragon type attacks.
Axew, Fraxure, Haxorus Druddigon
You'll need to get a Fraxure or an Axew and evolve it into Haxorus. You can find Axew in Mistralton Cave and you can find Fraxure outside of Victory Road on some dirt and rocks.