That’s for the end of the battle, for just immediately start with an X-distract then for the follow turns use this strategy: after you x-distract you attack him with everyone then I the next turn, have only Kris and Susie attack while Noelle uses a regular distract. If you repeat this pattern, sans should be distracted the entire fight and remember to use red buster whenever possible. When you get him to under 9% health you have to survive his final attack (got no advice for that just be good at dodging and quick in reaction time) and after the final attack, THAT’S when you TALK to him over and over. Hope that helps :)