Notes:
While I haven't removed the other cobblemon datapacks, I would suggest now only using AllTheMons! as it's far more stable and includes 95% of the content from the other ones!
Bugs:
c2me does have some issues with BetterEnd, however it's rather infrequent, especially if you aren't spending much time in the end.
Some Cobblemon are missing textures, you can try using other datapacks in the resource packs folder to patch this, however, it does sometimes lead to animation based crashes.