One random daily Mirage spot appears daily; more Mirage spots can appear due to StreetPass, but these additional Mirage spots will not have hidden items.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
Trivia
There is a spot just above a raised area on the east side of the map where the player can step on.