I was having the same problem, but I just found out witch fossil you find depends on if you have a even trainer ID number or an odd one. You get the Armor Fossil with an even ID, Skull with an odd one.
Okay, I'm playing Platinum and I'm spamming the underground for all it's worth while waiting on some other stuff to happen. I've found a few Armor Fossils so far, but no Skull Fossils. Both are in the game, right? Otherwise I have a somewhat annoying problem...
I was having the same problem, but I just found out witch fossil you find depends on if you have a even trainer ID number or an odd one. You get the Armor Fossil with an even ID, Skull with an odd one.
Okay, but do I get only that fossil, or does the other one appear with a lesser appearance rate (in other words, in my case, Armor is uncommon and Skull would be super-rare)? If I'm only getting Armor, then I'll have to do some digging in Diamond...
The book I got says you either get one or the other, not both. It sucks, I know... It's a good thing I got Diamond too.
And we got GTS as well.
Electric Pokémon Rule
B&W First Clear Team:
B&W Autum Friendly Tournament Team:
The First Latino team (GSC):