So I hadn't player Emerald in a good year and when I inspected my boxed pokemon I noticed some of them have a black square between the pokeball and their current level.
I can find nothing on Google and I've been wanting to know what it means.
Here is a picture of what it looks like in game. Note I grabbed a picture from the internet and added 4 black pixels but it is exact the same as in game:
If you know what it means please tell me. If you dont know it but you might know someone who does please ask him/her.