Plant Boss

The Plant Boss appears in the Battle Bears Zero Campaign in stage 4. It shoots acorns that explodes after a few seconds, although these acorns can be deflected using the Bubble Gun. It also attacks with its vines after you hit it twice they do not harm but stun you for a few seconds. Whilst fighting this boss pink and orange Huggables  come from three boxes in the middle and sides. When it is defeated it explodes.

ABBi says that the Plant Boss is a power source that feeds the base, probably by using photosynthesis. You can also see there are plugs on the wall connected to the plant's base.