Single hit and run is good vs him. When he tires, he will stagger on hit and that's when you hit him with living weapon.( you can also call it when he is nearly tired, then you drain his ki with a spam) When he rolls, he will Also call thunder, so only approach him after it's clear . Try to be at his side, near his back. But not directly behind him or his tail will tag you. Don't stay near him too long or he will use a spin move. Try to dash away when he calls thunder because he may call several and the bolts will chase you. His claws will miss you if you stick to his side, and be near his rear legs. You can punish him a lot if he misses and you are in a good spot.