I'll spam spinning, that's a good trick! (SSBU's level 9 CPUs autolose to Arm Rotor)
When working on my current project, I noticed how it seems like CPUs in Smash Ultimate are really bad at dealing with Arm Rotor, so I went to test it more thoroughly. And sure enough, it turns out Arm Rotor spam is an easy win button against level 9 CPUs. For whatever reason, they often just run, land, or roll into it, and if they don't get hit by it, they often fail to punish a move which has 41 frames of ending lag, 85 total frames of duration at minimum (and much longer if held), and is a whopping negative 37 frames on shield. Even if they shield Arm Rotor initially, they nearly always drop their shield too soon, getting hit in a situation where they should have gotten a strong OoS punish. There are three matches in this video, to show off that this exploit works against a variety of CPUs and not just against a specific character's AI, while the matches are one stock each so this video doesn't drag on too long.
For more videos of AI exploitation in Ultimate, check out this playlist https://www.youtube.com/playlist?list=PLIHpRvXPklmgh8rOSwCv7RWA1A9DKeXkh
If you want to see videos of AI exploitation from all Smash games, go to this playlist instead https://www.youtube.com/playlist?list=PLIHpRvXPklmin_CBFUfiMDgb2DJwyTaXm
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