Hypnosis is not a TM or HM therefor you can not get it but Pokemon can learn it like Hypno, Drowzee, Tangela, Tangroth, and so many Pokemon and their evoulutions
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Only certain Pokemon can learn it but you can't find the TM
Its not a TM. Your Pokemon has to learn it. like Gastly :) (Gengar in lvl 100 with hypnosis is pwnage :p)
You can get him at the safari zone.
you don't
Mount Silver.