After getting the first fossil talk to the fossil maniac who lives west from fallarbor town after you speak to him go back to the desert you should find Mirage Tower has appeared go in there with the Mach Bike to find the other fossil.
after beating the elite four , go to fallabour city and enter the fossil maniac's house.... enter the cave behind the maniac and go straight to the center of the cave.... there you will find dittos which are lvl 35 and above..... if you go still forward you will get the other fossil which you did not choose..... ( if you chose root fossil you get a claw fossil and if you choose a claw fossil you will find a root fossil)
you have to find a fossil
Go to http://www.serebii.net/emerald/tunnel.shtml It says that you can get the other fossil after beaten the elite 4. Go to the Ruin maniac in Fallarbor town and there should be a new cave. You'll find it at the end of the cave.
In Pokemon Emerald, the fossil maniac can be found in a house outside of Fallarbor Town. I'm not exactly sure when (Possibly after you get the fossil out of Mirrage Tower), he will not be in front of the hole in his house. Enter the hole, and you can find the other fossil, plus the cave has ditto in it, an excellent bonus. You can get there after you beat the elite 4
In the desert and in mirage tower.
only in emeraldyou have to go to the place where the fossil maniac is near fallarbor city go through his cave to find many dittos and at the end you will find the other fossilIT IS ONLY FOR EMERALD
the fossil maniacs brother
U get it from the fossil maniac
you will find the fossils in the desert. wait until the sand tower appears, then before it vanishes, go inside. climb to the top and choose a fossil. you can only take one.
The Helix Fossil, as well as the Dome Fossil, do not appear in Pokemon Emerald, Ruby, or Sapphire. The only two fossils obtainable in Emerald are the Root and Claw Fossil, which can be found in the desert in Route 111 (for Emerald, they are at the top of the Mirage Tower which appears and disappears frequently in the Desert), and you can only pick one of the two.
after you get the first fossil in the tower in the sand place go to the house where you get dig and when the guy is done making the tunnel there should be an entrance, go in and somewhere in the cave is the second fossil
I can only find one fossil, defeat the Elite four then go to the fossil maniac and go in the cave, you will find Dittos in the far right you will find a fossil Your cheater, Shadow (the Hedgehog)