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You've probably seen patches shine yellow, and noticed that they aren't Shiny, contradicting what Dawn says. Though a shiny patch will actually have light blue sparkles, instead of the yellow, which sometimes indicates a rare pokemon.
yes, the first time you use the pokeradar in the area
but the more of the same pokemon you encounter in a row the more likely it is you'll encounter a shiny
i've run into 9 smeargle and 10 nidoran in a row and the 9th/10th were shiny