The choice matters because it changes which Pokemon you will get from the fossil. The Dome Fossil will see you get Kabuto, which evolves into Kabutops, and the Helix Fossil will see you get ...

Mt. Moon is the first proper 'dungeon' you'll encounter in Pokémon Let's Go, and the Helix and Dome fossils are what you can look forward to as a reward for getting to the other end. It follows ...

Now would also be a good time to offer up the Dome or Helix fossils, as he can turn them into the Kabuto or Omanyte Pokemon, respectively. Not only is Aerodactyl a fine Flying- and Rock-type ...