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Gazimon as the normal-type regional rodent, even looks a little like rattata.
Elecmon as an electric type with Leomon as an evolved electric/fighting type?
Numemon/Geremon and Sukamon/PlatinumSukamon would also make good slug and sludge looking Pokes in the vein of shellos/gastrodon and grimer/muk. I'd probably put Numemon for grass/poison, Geremon for ground/poison, and the Sukamon line for steel.
