From Bulbapedia, the community-driven Pokémon encyclopedia.
TMs vary between generations. TM20 is:
This TM was not available before Generation IV
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Location
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Purchase price
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BW
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Currently Unknown
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N/A
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B2W2
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Currently Unknown
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N/A
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Location
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Purchase price
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Sell price
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MDGtI
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Currently Unknown
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N/A
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N/A
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Location
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Purchase price
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XY
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Currently Unknown
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N/A
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ORAS
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Currently Unknown
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N/A
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Location
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Purchase price
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Sell price
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SMD
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Currently Unknown
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N/A
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N/A
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Location
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Purchase price
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SM
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Currently Unknown
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N/A
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USUM
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Currently Unknown
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N/A
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Location
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Purchase price
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SwSh
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Currently Unknown
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N/A
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Location
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Purchase price
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Sell price
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BDSP
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Currently Unknown
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N/A
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N/A
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