None. However, If you have a Pokemon with the Pickup ability then there is a chance it will pick one up.
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There are none but there are 2 in the wild... There might be an action replay code for 999 rare candies, i think.
You Need Cheats The Wild Pokemon Modifier.
Easy, go to entra forest with your EEVEE and go to that moss rock and beat the wild Pokemon to earn the level [or use a rare candy. I don't know if it works.] then you have a Leafeon!
In order to receive unlimited rare candy in Pokemon Blue, first travel to Viridian City. Walk over to the northwest corner of the city and continue north. At this point, place a piece of rare candy as the sixth item on your list and talk to the bald man on the path. When he asks you if you are in a hurry, reply with "no." After listening to his speech, fly to Cinnabar Island and walk to the western coast of the island. Surf along the coast until you find a wild Missingno. Run away from the Missigno (do not attempt to capture) and you will receive unlimited rare candies.
a smoke ball is a item that when a Pokemon holds it it allows escape from a wild Pokemon