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The mushrooms on Paras' back have a mutualism with each other. The mushrooms get energy from Paras, while Paras gets to create spores. Paras evolves into Parasect once it reaches level 24. Paras is featured in The Problem with Paras under the ownership of Cassandra. It is extremely weak, but Cassandra needed it to evolve into a Parasect so she can use the giant mushroom to aid in her medical research. It does so towards the end of the episode.
Psyduck evolves at level 33. it learns water gun at level 9. Another go stronger move that is water type would be water pulse which is learned at level 22. Other moves to consider would be confusion, screech, and disable which are learned at level 14 (disable) , level 18 (confusion) ,and level 31 (screech) .