I've seen some runs using CPU allies and some others that didn't. Having an ally gives you advantage in most levels so I think it should be separated into "[no] ally" or something like that.

I know the AI is not the best but in my opinion it's better than being alone.

I'll be honest, I've never made any speedrun in my life, but hey, there's always a first time for everything. I wanted to give it a try after I saw someone on Reddit from my same country doing a WR in a Tony Hawk game.

Soooo yeah, I already have a game in mind to start speedrunning, hopefully I won't get too irritated after failing...