Old Man Shuckle had many Shuckle. He put berries in their shells and when time passed, he would've gotten berry juice. He uses Spoopy to find them. When Team Rocket drank the berry juice of a shiny Shuckle, many Pokémon, including the Shuckle, were attracted to them. However, Old Man Shuckle sprayed powder to nullify the effects.
None of Shuckle's moves are known.