Currently, a lot of actions related to pixelmon send a chat feedback, such as experience gained, evolutions, catching pokemon, learning moves, etc.. I do believe though that the ammount of information passed out in chat could be increased:
-Make it so when you swap a pokemon from your party to your PC, or vice-versa, a message appears in chat saying so.
This would help a lot with detecting issues, especially when thinking about servers, if something goes wrong.
EDIT: Just this would be enough, however stating to which slot/box would also be helpful.
Hope you consider this. Have a good day,
-Pio