How do you get the hypnosis TM in platinum?
There is no TM for Hypnosis in any of the versions of the game. Unfortunately, the only way to learn hypnosis is through breeding or your Pokemon leveling up. Level up haunter and it might get hypnosis.
You can't, there is no such thing as a Hypnosis TM. Your Pokemon must be able to learn it, like gastly, which u can catch frequently at the lost tower What sucks about that is that you can't trach Hypnosis to a Pokemon because there is no TM for it. The Pokemon has to learn it by leveling up. There might be some Move Tutors who might be able to teach such a move, but…
There is no TM you can get that makes Pokemon fall asleep, there is hypnosis, which u can not get as a TM, only certain Pokemon can learn it at a certain level, and there is dark void, and i believe only 1 Pokemon can learn that move and that's darkrai. theres also grasswhistle, obviously only grass Pokemon can learn it but that is also not a TM move. certain Pokemon randomly learn it.