Question

Or pokemon that have very few weaknesses,one of them being water

Answer 1

Gliscor only has weakness to ice and water.

Comments

OK thanks alot

Answer 2

Well the answer is no there is no Pokemon that is only weak to water and nothing else but there is Rotom-H who only has two weaknesses if you include levitate: Rock and Water

Then all pure Fire types and all pure Ground types have only 3 weaknesses: Water/Rock/Ground and Water/Ice/Grass respectively.

Comments

- Fire/Ground is weak to only Water and Ground.
- Ground/Flying is weak to only Water and Ice.

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I considered a double weakness as two in itself which is why I did not include them.