From Bulbapedia, the community-driven Pokémon encyclopedia.
Each location in the Generation II games has its own identification number used internally by the game. Enumerated here, in order, is what the seer in Cianwood City calls the Pokémon's capture location.
Can't tell indicates that the message "Whaaaat? I can't tell a thing! How could I not know of this?" will appear when the origin of the Pokémon is inquired.
Special indicates that the message "What!? Incredible! I don't how understand how, but it is incredible! You are special. I can't tell where you met it, but it was at level <level>." appears.