Once you get to Cinnabar Island, you go to the Lab next to the Pokemart and PokeCenter, then go down the hall to the last door and talk to the Scientist in the very back.
Chat with our AI personalities
GET FOSSIL FROM SCIENTIST IN MT MOON
Yes you can trade Pokémon between two Pokémon Yellow games.
Meowth is not in the wild in Pokemon Yellow. You have to trade to get it
tThe Helix Fossil evolves int Omanyte
Pokemon Yellow does not have meowth and it can only be obtained by trade.