for some reason, if any number of squirtles/ivysaurs/charizards switch to their alternate form, no two characters may change at the same time. so in order of player number(port 1, port 2, etc) each character finishes the transfromation in different times. player 1 finishes 1st, player 2 finishes second...yeah.
no real effect on gameplay, but its something neat to know