Sorry to say, it's not easy. First, you need to have the Pokedex, good leveled (10-20) Pokemon, and a LOT of time & patience. Just start walking around in the areas that you can catch Sneasel in, and keep doing it. And do it some more. Get ready to wait a while, because the odds of finding a shiny are about 8,000 to 1. If you're really lucky, you'll see a sparkle on a section of grass. Go there, and you're garaunteed a Shiny Pokemon. Might not be a Sneasel, but hey, like they say, if at first you don't succeed, hack, hack again... - wait, what did I say? No, you don't need to hack, but you might want to if you want one RIGHT NOW. If you can wait for a LONG time, then just use the method above.
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First you need to catch a shiny scrotum then level it up to level 50 and it evolves into a shiny rotom.
...shiny Pokemon are always shiny... ._.
The same way you would catch a normal Pokemon. The only difference is is that the Pokemon is shiny.
On Action Replay press disable Shiny Pokemon.
It takes luck to come across a shiny, but when you find one you catch it like you would catch a regular Pokemon.