I think I understand what you're saying... it will be hard to have your Pokemon's behavior come across "naturally" without the stats flashing out over their head so that the reader gets it, maybe? I would assume (as a reader) that something like defense and attack are intertwined and that you could show that (especially in relationship with another Pokemon) but not to the extent of feeling that it was ten percent better. Maybe you could add an expert to your party who can assess Pokemon skills and tell us as well as your other characters... ? My apologies if I have spoken out of turn...