1. XP Farm. Probably what these little guys are most famous for. Unfortunately I do not know if having multiple will stack the XP boost or not.
2. Pet. I adore these little guys because I think they are very cute. I love keeping them at my base because of their cuteness. (level Health and watch for those damn seagulls if you are close to the coast).
3. Kibble Maker. Their eggs can be used for Basic Kibble. Not the best, but that's something!
My name is ShinyChimchar01 and if you like this tip, I've done similar on Trike, Raptor, Parasaur, and Carbonemys. The next one will be on Moschops!