>>219285501. Get a fuck ton of repels and find the Pokemon you want in a big area, you need atleast 4 spaces away both vertically and Horizontally
2. Use your Radar, pick your bush and stay with it, choosing another bush will break the chain.
3. Always go for the farthest 4 spaces vertically or Horizontally, if none appear go back to the middle and recharge your radar.
4. Do not choose bushes that are on corners or right next to another bush, they have higher chances of breaking your chain.
5. Once your up to 40, do not go into any bushes and just keep resetting the radar till you get a Shiny bush, it will sparkle, and once you get your shiny everything will reset
Have a lot of patience and good luck
If it's not the pokemon you want, simply walk away till the music is gone and come back to reset, but running away while your chaining will reset the while thing so be careful.