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You need to use the move Rock Smash which you get in Mauvile City.
wayward cave
you go to the cave where oreburg gate go up break the rocks and go from the stairs go down see at the right side will see a poke ball on the floor break the rocks at your right and go that place and take it. you will need in the cave near the cycling road exit. --- Alternatively, you can go to Veilstone City's store, go to the 4rd floor and buy it (TM70) for 1000 pokedollars
You can get the TM28 (Dig) on Route 214 in the Ruin Maniac Cave in Pokemon Diamond.
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