You find it at night a lake acuity on Platinum if it is a female then give it a dawn stone for a frosslass.
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You can't you can only find snorunt in the pokewalker
no you cant. you catch spheal in Pokemon sapphire and snorunt in Pokemon ruby.
You could find a Snorunt in the Icy Mountain Pokewalker Route. If you specifically want a female Snorunt, you'll just have to keep seeing what gender it is when it appears.
ice cave
The only way to get a Snorunt is to transfer it from your Pokewalker. You get Snorunt on Icy Mountain Road on the Pokewalker. You can also trade a Snorunt from the GTS.