The Three Dogs
You know the three dogs Raikou, Entei, and Suicune? If you incounter them once they will be in your Pokedex. If you look them up it will have their nest in it. As you probably know they are constantly moving. Look up were they are and then fly there. This DOES NOT work most of the time but sometimes they will stll be there and you can go in the grass and catch them. It does take some time but to me it was a lot quicker than just walking around in the grass looking for them.
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