I don't think you could.I've had Pokemon leafgreen for a long time.I know what your talking about.Like on Pokemon Ruby and Sapphire.
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I think you need a Pokemon with a specialy natural ability that will dig up items if you walk over them.
Walk around for a hundred steps. Then you should be able to use it again.
You can't because you might not have a Walk Through Walls cheat/Tweaking glitch.
Walk through the wall.
walk through walls 509197D3 542975F4 78DA95DF 44018CB4 [M] (Game version 1.1) 9820F6AE8203 2A2082A9A143 50C4AB43573D [M] (Game version 1.0) Sorry there are no codes for shiny Pokemon 9820F6AE8203 8359EBCF20F5 DC89BB73F72F (version 2) (m) 888ce486 Dc49f2ef 56671f3a 6f4f4d6b 24c35e88 037c3033 78da95df 44018cb4 28f71f08 Abb36538 69ba4f26 72716663