Patches of grass in the immediate area will shimmy if there is a Pok&eacute;mon there. There are certain species of Pok&eacute;mon that can only be caught using this device, though there is the possibility of encountering a Pok&eacute;mon native to that area.
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The radar&#39;s need to be recharged depends on if you defeat the Pok&eacute;mon you just faced.
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Patches of grass that shimmy <em>and</em> sparkle will produce a shiny Pok&eacute;mon. This can be achieved via the controlled process of chaining.