What weapons should I use, he's kicking my pet's ass! Help please? (tier 7)

Is Shusei your battle pet? You should definitely get 10 wins at his stats pretty effortlessly.

What are you using? Make sure your not using any Shrieks or other freezers since they are pointless against him.

Frankly I have not much of a clue what I'm doing, since I don't battle much, but I used some swords and bombs on him and yes, with Shusei.

are you still having trouble with him? it looks like shusei is tier 8 by now so you can borrow a few of my weapons if you still need to beat him! I mostly used to block his light attacks while blasting him with and or heal with , they're all SUPER useful though so it might be useful to get them yourself. You could probably win without the Soma Tablets though if you don't want to invest in those quite yet.