I killed Validar with Gauis. It was surprisingly easy, I only had to do 3 resets and use some Staves. Gauis was killed on the 1st try, Emmeryn was killed on the second try, and Gauis was killed again on the 3rd try. He didn't use Roy's Blade, but Sully did a Dual Attack on two of the tries. Gauis did 12 battle per battle, Sully did 3 damage per Dual Attack.