diamond your haku and hinata, copper your tsunade, Also make sure that you have it so that your wrath is full from start, hit with stun chance and up the abilities of them. other than that, I dont know how you are going to be able to do that unless you want to save up and spend the 1k gold to get the training material to upgrade sausuke. I did and I kinda regret it but I got sasuke upgraded so I could fight him

Hey so I have two kurama Naruto's one is maxed out the other isn't and I still can't train him.

farm either 13-11, 13-10, or 13-6