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Really simple (If its the same as in DPt otherwise i dont know what im talking about) You use it and observe the moving grass. Some move faster then others. Memorize a speed and walk into it. Lets say its duskull. Kill it and after radar battles that result in you KO'ing the poke grass will move after the battle WITHOUT the use of your radar. Find one thats the same speed and walk into it. Hopefully its another duskull. KO it. Keep KO'ing the same poke, and every time you do it a shiny occuring (Which has its own unique grass animation of blue sparkles) Goes up until at 40 when it is guaranteed to occur. Beware as other pokes occuring will break your chain and force you to start over. Stock on repels and avoid other grass speeds.
