999

in a real fight to win ???well in a real fight where we fight to win it was 254

Around 569.

I've reached over 300 a few times in regular fights before dying.

Luigi's taunt consecutively equals ??? damage?

I was in a custom level once that had an area that was really hard to get kicked out of (you usually bounced off of a wall or tree) so having three players with 300+ was common. I think I got up to like 672 before glitching through a wall to finally die.

around 400

I've reached only around 250%.