Well once you learn the first 3 forms' attacks(the last one's difficulty depends on how well the Ai is with your character), you can dodge them pretty easily and just time your attacks with your dodging.
I've actually beat him on 9.0 before(with damage, of course) with Dr.Mario and on 8.5 with Yoshi(who I rarely played with in Smash ever before) and I don't think it would be next to impossible(unlike with SNK bosses) to do that.
Of course I won't be trying to do that, though. Still takes a ton of skill to be able to time those dodges!
I've actually beat him on 9.0 before(with damage, of course) with Dr.Mario and on 8.5 with Yoshi(who I rarely played with in Smash ever before) and I don't think it would be next to impossible(unlike with SNK bosses) to do that.
Of course I won't be trying to do that, though. Still takes a ton of skill to be able to time those dodges!