Well the size does matter in this case, otherwise the sprites won't fit in rmxp. Also remember the icon and front sprite should be separated, not in one picture. For the second pose of the pokemon icon, well, you may just adjust the gesture of that pokemon so it will be animated in the pokemon summary screen. You may check the charizard sprite I sent you and see how to make an icon sprites in rmxp format. Like I said before, size of the icon sprites should be 128*64, while the size of the front sprites ought to be 128*128.