Forcefeeding it stimberries will make it produce alot of poop. Very useful for creating fertilizer with compost bins or dung beetles.

OH GOD SO MUCH POOP

If you're leveling up your Phiomia, I'd choose hunger for it. That way, you can feed it more stimberries without the chance of it dying of starvation.

Beware,when you feed the phiomia stims in order to make it poop,it will soon starve to death if you dont feed it berries.