A non-damage dealing move that allows a Pokémon to switch out during that turn. It avoids things such as Confusion, and any move that may prevent it from doing so (e.g. Mean Look), so it's...
A relay race.
No, Jynx cannot learn Baton Pass.
any of the relays... 4x100, 4x200, or the 4x400
it swiches to another Pokemon in your party :-p