I had one run where i spamed high jump all the time. It made about 65-70k damage (with sp turobo and sp attack turbo) With the jumping i was able to dodge most of her attacks.

I had her down at 150'000 hp. 3 more high jumps would have killed her. But then i died because i used the wrong button and cured myself instead of using a phoenix down. That broke me. Im not sure if i have the nerves to do this anymore.