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If you were looking for the glitch move, see TM21 (move).

TMs vary between generations. TM21 is:

This TM was not available before Generation IV
Generation I
Bag TM Grass Sprite.png Mega Drain
Location Purchase price Sell price
RBY Prize for defeating Erika N/A PokémonDollar.png2500
Generation II
Bag TM Normal Sprite.png Frustration
Location Purchase price Sell price
GSC Goldenrod Department StoreSu N/A PokémonDollar.png500
Generation III
Bag TM Normal Sprite.png Frustration
Location Purchase price Sell price
RSE Pacifidlog Town N/A PokémonDollar.png500
FRLG Rocket Hideout N/A PokémonDollar.png500
Colo. N/A N/A PokémonDollar.png500
XD N/A N/A PokémonDollar.png500
MDRB Mt. Thunder*, Great Canyon, Mt. Blaze*, Frosty Forest*, Mt. Freeze*, Magma Cavern*, Sky Tower, Howling Forest, Stormy Sea, Silver Trench, Fiery Field, Lightning Field, Northwind Field, Northern Range, Pitfall Valley, Buried Relic, Wish Cave, Desert Region, Southern Cavern, Wyvern Hill, Solar Cave, Darknight Relic, Grand Sea, Joyous Tower, Far-Off Sea, Purity Forest
Kecleon Shop (Joyous Tower, Purity Forest)
Monster Houses
Buried items (Buried Relic)
Pokémon Square shop
Job rewards (D-★)
3000 Poké currency.png 1000 Poké currency.png
Generation IV
Bag TM Normal Sprite.png Frustration
Location Purchase price Sell price
DPPt Veilstone Game Corner, Team Galactic HQ 8000C PokémonDollar.png500
HGSS Goldenrod Department StoreSu, Celadon Department Store PokémonDollar.png1000 PokémonDollar.png500
PBR* Currently Unknown N/A N/A
MDTDS Currently Unknown N/A N/A
MDBSL Currently Unknown N/A N/A
Generation V
Bag TM Normal Sprite.png Frustration
Location Purchase price
BW Nimbasa City PokémonDollar.png10000
B2W2 Floccesy Ranch N/A
Location Purchase price Sell price
MDGtI Currently Unknown N/A N/A
Generation VI
Bag TM Normal VI Sprite.png Frustration
Location Purchase price
XY Connecting Cave N/A
ORAS Pacifidlog Town N/A
Location Purchase price Sell price
SMD Kecleon Shops 1720 Poké currency VI Sprite.png 172 Poké currency VI Sprite.png
Generation VII
Bag TM Normal VI Sprite.png FrustrationSMUSUM
Bag TM Dark VI Sprite.png Foul PlayPE
Location Purchase price
SM Malie City N/A
USUM Malie City N/A
PE Pokémon Mansion N/A
Generation VIII
Bag TM Psychic VI Sprite.png Rest
Location Purchase price
SwSh Ballonlea N/A


TM20
Technical Machines
TM22