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.
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No.
Gliscor, being a Ground/Flying dual-type, is weak to Ice (x4) and Water (x2). Gliscor is resistant to Fighting, Poison and Bug (x1/2) and immune to Ground and Electric (x0).
Route 212 (after winning at pastoria gym)
It depends on what the stats are for it and what you think is better.
Not yet but soon he will evolve into Toxicroak after the Sinnoh League if he jabs all the time with Poison Jab.