You can find it by using a Super Rod on Iron Island.
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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.
how do you catch a mewtwo on Pokemon platinum
you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
you can catch it on routes 32, 16, 17, and 18 at night by fishing. There is a 15% chance you will catch it.
vulpix is not in Pokemon platinum version.