Parasect

Parasect's access to the rare Spore and a solid ability in Dry Skin cannot make up for the several crippling flaws it has in the PU metagame. It is absurdly slow, has lackluster bulk, and has an awful defensive typing; it is notably 4x weak to Flying and weak to Rock-, Ice-, and Poison-type attacks as well, which are all common in the PU metagame. Most of what Parasect can attempt to do, other Grass-types can do a lot better. Tangela has access to Regenerator and better bulk via Eviolite, Roselia has access to entry hazards and a solid secondary typing in addition to Eviolite, and Ferroseed has a far better typing and also can set entry hazards. In general, these Grass-types also lack the aforementioned problems that come with Parasect's Bug typing.