Is it a TM? Or a move only certain Pokemon learn? If the second one, which Pokemon?
No. It isn’t but, there are ways to get it on certain Pokemon.
Instead of writing it down, I think I should just direct you to the bulbapedia page on Baton Pass. (It shows the Pokemon that can learn it via level-up and pokemon that get it via breeding.)
Page: Baton Pass (move) - Bulbapedia, the community-driven Pokémon encyclopedia