Once-In-A-Lifetime ribbon

[MIO1339]

what is the correct memories on this @Atrius97 @Kaphotics did you already figure out this?

[theSLAYER]

Not known to exist, at least not in the current game’s code 

[Atrius97]

It's been mentioned before, but while the official guidebook states it should appear with 1/100 odds on Pokémon sent through Surprise Trade in SV, it doesn't appear to have been coded to exist.

Several people traded over 5000+ Pokémon without seeing a single instance of it occurring (one person while livestreaming the entire time), which would be near impossible if it was the intended 1/100 chance. No one has found a legitimate instance of the ribbon in the wild.