Moose worth using

later my solo fun in wx-78 for some reason my friends wanted to try again and ı decied to use funny canadian man woodie, this time after ı used for some time, ı liked the transformaion but rn my least favorite is moose hes way to slow and ıdk what the hell can ı even use the charge atack for.
but everyone says its really good against bosses which how? does it give more damage or something?.Also pretty sure ı drop my armor so can ı even block damage???
if ım wrong about something pls let me know(ı was already behind reworks and now there is a f*cking skill tree??😭😭😭)