Just defend till you can use rude buster (use it on Chrises turn for more damage)
Thanks for the advice! I didn't see it until after I beat him, actually, but that's definitely a better way than I did it before!
Just curious, how did you beat him?
I didn't know about the defend mechanic at all until later (admittedly, I haven't gotten around to actually playing deltarune...), so I gathered enough TP for Red Buster through just grazing Flowey's attacks
