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TM 84 contains the move Poison jab. This TM is located on route 212. This move has a power of 80 and can poison the foe (a really nice move)
A Gliscor can be taught Poison Jab either by going to the Move Relearner in Pastoria City and giving him a Heart Scale in exchange for Gliscor learning Poison Jab or you can use the Poison Jab TM in order to teach it to Gliscor.
Route 212 (after winning at pastoria gym)
poison sting, harden, toxic spikes, Hyper beam, poison jab, solar beam, spikes, twin needle, string shot,
Teach it TMs for all of them EXEPT sky uppercut is ONLY an egg move for riolu