you have to use the HM surf
Surf there from pallet town (home town)
Surf down from pallet town, or west from seafoam island.
South of Pallet town.
South of Pallet Town
Surf south of Pallet Town.
Surf down from pallet town
If you surf south of Pallet Town, Cinnabar Island is that way.
surf south from pallet town.
surf south from pallet town
cinnibar island is below pallet town, but you have to use surf to get across the sea to get to cinnibar island
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.
Blaine in the cinnabar island he uses riddles