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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.
Skitty evolves with a Moon Stone, Wailmer evolves at level 40, Spoink is somewhere around 32, Golbat needs to fully like you to evolve, and Pineco is somewhere around 30.