Kingdom Hearts III (PS4) - Keyblade Graveyard Vanitas No Damage CM LV1/All Pro Codes

Vanitas is actually easier if you loop him. Block doesn't fail trying to do this loop and it's far more consistent than trying to fight him legit. This strategy makes the fight go a lot quicker too.

I do not take credit for finding this loop. Beeboy did it first. I had to go look how he did this boss fight just to do it with these restrictions.

Restrictions:

Critical Mode
Level 1
All Pro Codes
No Damage
No Magic use from Sora
No Stat Boosters
Desperation Move Skip