The entity renderer is unable to render Cobblemons, probably because the Cobblemon species is determined by NBT un der the cobblemon:pokemon entity.

Could Isometric-renders be able to render the Cobblemons?

In order to debug this properly, I need your latest.log (or well, the log from a run of the game where this issue occured). I'm fairly confident this should be resolvable, but only the log will tell

Cheers

Seems this was fixed on my end as it doesn't crash anymore.