The sort of mayor figure of Sapling Village, a Pokemon known for his wisdom in the ways of trading. Shroomsworth originally learned all of his bartering skills from this old Parasect. He runs The Commerce Mushroom.
Honestly, I think that'd be really cool. In Pokemon, there's always a legend about the legendaries cause they're all powerful or dangerous or something. I'd really enjoy hearing a story about the worlds oldest Parasect and how it's age has caused it to become special somehow. Like, the spores having a rare healing quality or something.