>>39689225These guys are artificial Pokemon created in a chemical laboratory. They were initially made as "living medicine"; lifeforms that would be able to change their chemical composition to cure whatever ailment the ill have. However, something went wrong, and the resulting Pokemon were entirely toxic- being able to change what type of poison they were rather than what type of antidote. The method of creating them was eventually stolen by a rogue employee and sold to the local mafia.
The Pokemon themselves are not super hostile, however, and Psyial tend to try to carry out their intended purpose of healing the sick- however, in a cruel twist, they cause more harm. When evolving into Chemistrike, the Pokemon become more apathetic and cold.