From Bulbapedia, the community-driven Pokémon encyclopedia.
TMs vary between generations. TM21 is:
| This TM was not available before Generation IV
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Location
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Purchase price
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Sell price
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| RBY
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Prize for defeating Erika
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N/A
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2500
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Location
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Purchase price
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Sell price
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| RB
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Currently Unknown
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3000 Poké
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1000 Poké
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| TDS
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Currently Unknown
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N/A
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N/A
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| WiiWare
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Currently Unknown
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N/A
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N/A
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