Dragonite is generally considered the better Pokémon due to its high base stats and versatile movepool. It has better overall bulk and offensive capabilities compared to Aerodactyl, which is more of a niche choice for its speed and Rock/Flying typing.
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In HeartGold, Dragonite can learn the move Hurricane by leveling up. It learns Hurricane at level 55.
Go underground and dig up an old amber. Then take it to where ever you go to resurrect fossils. sorry i don't know where it is because my brother has platinum not me. The old amber is very rare so it will take a long time!
In Pokemon LeafGreen, the Dome Fossil can be revived into Kabuto, and the Helix Fossil can be revived into Omanyte.
Blitzle is way better
Helix fossil turns into Omanyte once you bring it to the Fossil guy on Cinnabar Island in the old Research facility. The Dome fossil turns into Kabuto. And then you can get the Amber from the Museum, which will turn into Aerodactyl