I worked with this guy who claimed he was a member of Mensa.
When I trained him I told him you might want to keep a folder to write down some of this information it is a lot to learn. He said "I can remember it all without notes."
I had to tell him things over and over finally, I would tell him "I thought you could remember all this." Mostly I would tell him you could figure it out you're so smart and I'm not and just leave him hanging. Misc. file issue type of solving problems all the time. I grew tired of bailing out the self proclaimed genius.
I was glad when he went to a different shift.