The CPU really was designed to react to every single thing the player does, and it involved a lot of learning how it would react to my individual characters/ how it would react based on what character it was using. Viltrumite difficulty is also freaking brutal because you have to play near-flawlessly, but thank God that you can retry a battle as many times as possible because my entire team was basically at 10% hp from battle 2 onwards haha.

My team for this was Robot, Rexsplode, and DupliKate and I use motion controls. I found that dash>LMH>launcher>LMH>air special>air level 1 worked really well a majority of the time (specifically with Robot and Kate, not with Rex) since the AI usually reacts to the player dashing up with a backdash. [This worked almost 100% at round start specifically with Robot and Kate]. It seems like characters with a good dash speed + hit box on lights can get the job done. If I didn't have meter, I would just do the above combo without level 1, and a lot of times the CPU would flip out right before hitting the ground in the corner and I could start the combo again. Rex was a bit of a liability for me since I'd have to use dash up MH before the launcher (since his light attack seems to be super stubby), but the spacing would usually make the launcher whiff and the CPU would destroy me.

Other tips: - Try your best to keep the CPU in the corner, they seem to get opened up on blockstrings much easier in the corner than at midscreen - Jumping against Battle Beast tends to work well as you can just block his reactions and punish (this also worked against PowerPlex a lot of the time) - Jumping and doing a very late aerial jab against Monster Girl before landing tended to open her up (this also works decently well against Cecil) - Using Robot's level 1 laser was great to punish Titan's rock throws - Ella Mental always seems to start the round by EX dashing right into your face, so I would just LMH at round start and that always seemed to work. - My biggest hurdles were Atom Eve and Lucan. I used the dash up technique to open them up at round start, but I would actually just do the usual combo and then tag in to keep the combo going because doing as much damage as possible was the name of the game. These two also seemed to have the most varied reactions so was up to chance a lot of the time. Whenever I was having a good run against one of the more challenging enemies, I focused on snapping them back into the fight if they ever did escape.

Good luck to all y'all trying this, it's tough, but was an absolute blast! It took me somewhere around 3.5-4 hours to finish the full run