Pokedex be like:

“The giant mushroom has fully taken over its host now. The paras beneath the mushroom has been consumed and its internal organs have been replaced with roots and fungal flesh. Parasect has an insatiable compulsion to spread its spores and propagate its species by infecting the lungs of its victims. Sometimes entire city blocks will be evacuated after swarms of Parasect begin to colonize the basements of apartment complexes. They are known for being friendly.”