If hit by a Fire-type move, changes to Water-type. If hit by a Water-type move, changes to Grass-type. If hit by a Grass-type move, changes to Fire-type.
A scientist was experimenting with Kecleon DNA when a test tube of DNA fell into the mouth of a Pansage who lived in the lab. The Pansage drank the stuff, but nothing happened. A few weeks later, he gave the Pansage a Leaf Stone. It evolved, but not into Simisage. It became Simipotent, a fusion of the elemental monkeys with the abilities of a Kecleon. It broke free, and roams Pinwheel Forest.