Yeah, Myotismon is really weak though from my experience so I would still keep a back-up in your digi-beetle and a couple of items just in case. I would also take him out the moment you get your ultimate to learn HP recovery again.
I could grab myotismon and insta DNA him with metalgreymon for a birdramon. and raise it to garudamon. It would have an ok attack then, the heals, myotismon's area attack, and better stats. That is depending on tempo of the run and if i can fit the training in.