It's not that complicated once you get the basics down. I'll teach you once you get here.

Tutor. Move tutor. You know, like a one-on-one, personal teacher who helps you out in a subject you're having trouble in. I never had one personally, but some of the other students in the School for Gifted Unicorns did.

Of course, the word seems to mean something different in Johto. They're people who wander around looking for Pokemon to teach moves that they know to. Why? I have no idea.