While you can freely choose Q as a playable character, you can't actually fight him in Arcade mode normally, since he never shows up as a selectable opponent. Instead, you can fight Q right after the 7th opponent after meeting these requirements:
- Don't lose a single round
- Get at least 5 super finishes
- Get at least 2 special points, which you can obtain by getting a better rank in the following match (for example, if you got a C in the previous match and then got a B in the next one)
- Don't get a lower grade than a C (not entirely sure about this one)
As for the fight itself, it's pretty easy. Q isn't that great of a character in this game, so he's not really hard to beat. A lot of his attacks are very punishable and he also has a huge hitbox. Just make sure you know when to block high or low and you're golden.
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