It now appears to be fully under the control of the fungus on its body, often shambling around eerily as if being puppeted. Its only concern seems to be maintaing the fungus and spreading its spores at much as possible.

"Because the fungus fully controls its motor functions, it's quite clumsy on its feet. It thrives in dark, damp areas where more and more fungus can overtake it until its wooden body eventually rots away." saved spare dex entry