sneasel can be found in leafgreen at icefall cave on four island, gligar can be found in the johto area of the safari zone in Pokemon emerald.
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Gligar will only evolve at night-time(best time:12.00midnight)but,it will have to hold the item razor fang,just like weavile,sneasel has to hold the razor claw and level up at night so do the same with gligar,but give it a razor fang(can be found at the fight area in the battle tower)then it will evolve into GLISCOR which can learn thunda,fire 'n' ice fang!>!>!>!>!>!>!>!>!>!>!>!>!
around snowpoint city
With Pokemon Emerald inserted, you can find Gligar in Route 206, 207, 214, 215, 227, and in Stark Mountain. It's easier to trade for it from Pokemon Platinum, for it doesn't require Pokemon Emerald to find Gligar in the wild.
route 217
giant chasm