I used Ganondorf for this one, because from what I read online, the usage of his neutral Special (Warlock Punch) makes quick work on some fighters. Indeed it does, but the only battle that got me sweating is the Fire Emblem one because Ike was the remaining one of three fighters. I did manage to get Intensity 9.9 before Master Hand & Crazy Hand without losing a battle. This allowed for the usage of Classic Tickets without worrying about it being capped at 9.8, and I only needed to use one.Advice for clearing 9.9. intensity would be simply sticking with a character you're most comfortable using. However I do think maybe some routes are harder than others. I DID clear with Mario on 9.9 intensity though other people commonly remarked on Mario's route being hard even though it took me maybe two tries and I thought wasn't too bad. I guess when you're up against the Koopalings, Dair's and back throw your friend, since knockback against them does seem higher than normal.
That leaves me with the Ken challenge in Century Smash. I am guessing that the lack of advice so far is indicative that it's actually easier than my experience with overcoming it?
Thank you for reading.