Surf to it from cinnibar or fly to it from anywhere.
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Can you not just come back the way you came from? There shouldn't be anything prohibiting you from returning to Pallet Town. If you are far enough into the game, you can also fly back to Pallet Town, but if not, just use Route 1 from Viridian City to take you back to Pallet Town. You can also surf from Cinnibar Island north to Pallet town via Route 21.
Just fly back to Pallet Town or just head South from Viridan City.
meet him an island near pallet town
A person can get to Pallet Town in Pokemon Crystal by first defeating Snorlax at the cave. Then, proceed to Viridian City, which leads into Pallet Town.
Pallet Town is where it normally is, south of Viridian city.