inside the mirrage twer is the two fossil
mirage tower only appears in pokemon emerald.
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! :)
Talk to the Fossil Maniac he lives to the left of fallarbor town then go to the desert to find Mirage Tower.
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You need mach bike
in the dessert where mirage tower is
You Get To Catch Rayquaza
the go
Go to route 119. stick to the top of the water and there should be rocks that make a path. follow the path until you get to mirage tower. youtube helps to kiddo
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.
they are at the top of mirage tower the tower in the desert north of mauville city
In Pokémon Emerald, Mirage Tower will appear in the Desert that is to the North of Mauville City however it will only appear once you have spoken to the Ruin Maniac in Fallarbor Town. Once you head into the Mirage Tower, you will need to use the Bike that is the Mach Spike because of the various sensitive cracks in the floors. However once you have picked 1 of the Fossils then it (the Mirage Tower) will disappear and it will not return at all.