I noticed today when I went to fly my balloon, one area had a blue star on it. What does that mean?
1 Answer
Stars increase the chance of finding rare and evolved Pokemon in that area.
Each area can have up to 3 stars on it, (1 blue, 2 green, 3 red).
Usually an area with 2 stars has an evolved third-stage Pokemon as a boss (for example Greninja instead of Frogadier, Talonflame instead of Fletchinder, Ampharos instead of Flaaffy), 3 stars grant you a Legendary Pokemon.
Random Pokemon are stronger, too. For example, in a 3-star level you can also find bosses in hordes.
As a side note: sometimes you can find a rainbow on the background of the area selection, which adds some random stars to the areas. This mechanic is called Fever.
More info on Serebii.
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