can u keep shaymin in sky forme when u do a wireless or wifi battle? cuz i did one once and he just went back to land forme when the battle started
from what i remember, the alternative forms were not introduced until platinum, so that may be the case? i'm not entirely sure though, since i've never used any of them before.
Edit: I just did a quick google, and found that you cant use any alternative forms in wi-fi.
Edit #2: [Question] Does anyone know if there's a pokemon with an ability that prevents confusion by any chance?