The top floor contains two fossils. To get to the top, a Mach Bike and Rock Smash are required. Wild Sand shrew and Trapinch can be found in the tower.
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Mirage Tower is in the desert around the enterance near Mauville. It only appears every once in awhile. I'm not sure how often though.
In Pokemon Emerald, The Mirage Tower appears randomly. All you have to do to make it appear is keep going back-and-forth from Fiery Path to the Desert and it should appear. Just make sure you have the Mach Bike, You'll need it inside the tower to get past the fragile sand floors. And at the end of the Mirage Tower, you'll get a nice suprise! :)
It will disappear and reappear in the desert on Route 111 as the player visits and leaves the Route.Do not confuse it with Mirage Island.
In Pokemon Emerald, both the Root and Claw fossils can be obtained. One may be selected at Mirage Tower and the other will be found at the end of the Desert Underpass.
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