I would say any fighting types.
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It would be hard to beat him without evolving it in to swampert first, because then swampert can learn muddy water. But marshtomp's most effective move should be Mud shot.
you should train a water Pokemon or teach your treecko rock tomb
The best way to beat Brawly is to catch a Sableye in the Granite Cave on route 106 next to Dewford Town.Hope this helps:)
i say that you should use salamance, wishcash, gardevoir, flygon, blazekin and rayquaza because thoughs were the Pokemon i used and beat elite 4 5 times!!!!!!!!!!
you evolve a duskull at lvl 37 one of the best ghost Pokemon on emerald