The PokéRadar works largely the same as before. When you activate it, several areas of grass will shake. When you go to them, a Pokémon will appear. Defeat it and it will commence and continue a chain and more areas will shake. The more a patch of grass shakes, the rarer the Pokémon. If you continue the chain, there is a hidden bonus of the possibility of a shiny patch with the probability topping out at a chain of around 40.
The general rule of thumb for continuing a chain is that the patch should be at least four squares away from you. If it’s on an edge, the chain will end. If you get interrupted by other wild Pokémon, the chain will end. If you enter a patch with a different Pokémon, the chain will end. If you equip the rollerskates, the chain will end. If the patches you receive don’t match the initial shake or are too close, you can reset this instance of the chain by walking on the grass to power the Radar and activating it again.
Patches of grass as well as flower beds are all capable of being utilised for PokéRadar chains.
You will only find Pokémon you’ve encountered before , and occasionally there will be a shaking patch with no wild Pokémon in it.