The Dome fossil gives you a Kabuto, and if you evolve it, it will be stronger. However, the Helix fossil will give you Omanyte, a rarer Pokemon. This gives you the option of choosing between a rare or strong Pokemon.
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There is NOT a Deoxys fossil. Deoxys is extinct, as there isn't an event in the WORLD that gives him away.
There is a lady with a backpack on she gives you either a plume fossil(Archen) or a cover fossil(tirtouga)
When you go to relic castle a person will say "Holding these Pokemon Fossils is too much weight. Would you like one?" Then, you have a choice of which one to choose. I have Pokemon black and white, so i got both. The Plume Fossil gives you Archen, and the Cover Fossil gives you Tirtouga. Once you receive your fossil, go to the museum in Nacrene City and talk to the woman on the left.
In the first bit of relic castle talk to the woman she gives you the choice of plume(archen) or cover(tirtouga) fossil
Don't you mean yellow not lighting yellow? Anyways you get charmander past Nugget Bridge and off to the left and a guy gives you it.