You have to dig in the underground with the explorer kit you get in Eterna city. It depends on what your last number in your trainer id is. I think it's even for armour fossils nd odd for the other one. Good luck >_<
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You can not get an Armor Fossil in HeartGold.
you have a good chance you just need to use your explore kit and dig down there and you can also find other fossil down there to
only a cranidos fossil is available before you complete the pokémon league but after you can find any. Wrong, horribly wrong. I found a Armor Fossil and haven't beaten the game yet. Maybe its just on Diamond and Pearl
You only get one fossil in platinum but you can get it over and over again. It is a skull fossil witch is a Craniados.You are so wrong! I also found claw fossil (anorith) and my friend found a armor fossil (shieldon)you are so wrong,i found a floor fossili found a root fossil (lileep), and a shell fossil (omanyte)I found a Helix Fossil (omanyte too) :)I found Old Amber (Aerodactyl) and Dome Fossil (Kabuto) C=Ok, two things are wrong here:1. There is no such thing as a floor fossil, not in platinum, not in anything.2. I've never heard of Shell Fossil, and I'm a Pokemon expert, so either it doesn't exist, or it belongs to some other Pokemon, but Omanyte is ONLY in the Helix fossil.
You have 9 types: Armor Fossil, Claw Fossil, Cover Fossil, Dome Fossil, Helix Fossil, Old Amber, Plume Fossil, Root Fossil, Skull Fossil