PokéBase - Pokémon Q&A
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After the National Dex.

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really,I have the National Dex.and I have like 29 Heart Scales in platinum.

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A Heart Scale is uncommon.

As of 2023, there’s still no known percentage for the Underground Items.

Source

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edited by
I need a percentage.
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Serrebii.net says its "uncommon" which means basically rare. So im going to say about 10% chance but I cant be sure.

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