So if you gave it a slowpoke tail to latch onto, and traded it then wouldnt that be long enough time to become a parasite?
Probably, but the Slowpoketail wouldn't be able to sustain it for long. There'd have to be some other way of keeping it alive, but I don't know if Slowpoke essence is the only thing they eat.
So it could work, maybe it could be called Parader or Shellasite or something.