Rock, Ground, and Water-type Pokemon are weak against Grass-type moves. This means Grass-type moves can deal twice the damage to the listed types.
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Fire type has the very strongest advantage over Grass type Pokemon
Fire.The fire will burn the grass and also ice,flying,poison,and bug type :D
A Fire-type Pokemon can deal 2x the damage to Grass, Ice, Bug, and Steel-type Pokemon.
Poison is strong against grass type Pokémon.
Really, any Pokemon can beat a water Pokemon if its strong enough but the easiest way is to use a grass or electric type that has a same or greater level than the water type.