1. More specifically, try to use 3 coins with every turn, and it doesn't always have to be with 2 border coins, it can be with just one. If he never throws a one at you, you can do it in I think eight turns, but you should be able to win even if he does throw a few ones at you. One time when I did this, he threw three 1s at me and I still won on the 15th turn using this method.

3. Paine's special dress sphere has an attack called Fright (it's available after you learn Assoil) which causes Confuse and Delay. So you can do this move and still have time to exit to normal mode so the girls can learn Mighty Guard.