Flygon is a really good Ground type. I also reccomend that you do the Mudkip sidequest. Swampert is a great pokemon, offensively and especially defensively. Scolipede, Roserade are really good. Toxicroak is phenomenal, and it gets a water immunity with Dry Skin. Like Lord_Ludo and AnimeFg said, Nidoking has beautiful coverage.
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