Qwilfish is found in the Water around Iron Island after you get the National Dex. You need to fish with a super rod in order to get it.
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Go to route 32 find fisherman Ralph register him and get a phone call from him about qwilfish
Qwilfish does not evolve.
You can find it by using a Super Rod on Iron Island.
you can find it at iron island, you will need a super rod, and make sure you have lots of pokeballs
you can't catch qwilfish in emerald. the only gba Pokemon game that I know has qwilfish is fire red. However to the answer stated above you can catch Qwilfish in Pokemon Colloseum, purify it, and then trade it to Emerald via. a GNC/GBA connector cable.