TM66

TMs vary between generations; however, TMs numbered 51 to 92 were not added until Generation IV; TMs numbered 61 to 100 do not exist in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!.

TM66 is:

This TM was not available before Generation IV

Generation I Struggle Location Purchase price Sell price RBY Pallet Town N/A N/A

Generation II Struggle Location Purchase price Sell price GSC New Bark Town N/A N/A

Generation III Struggle Location Purchase price Sell price RSE Littleroot Town N/A N/A FRLG Pallet Town N/A N/A Colo. Outskirt Stand N/A N/A XD Pokémon HQ Lab N/A N/A MDRB Currently Unknown N/A N/A

Generation IV Payback Location Purchase price Sell price DPPt Route 215 N/A 1500 HGSS Route 35 N/A 1500 PBR* Currently Unknown N/A N/A MDTDS Steam Cave 6500 250 MDBSL Currently Unknown N/A N/A

Generation V Payback Location Purchase price BW Route 16 N/A B2W2 Route 16 N/A Location Purchase price Sell price MDGtI Currently Unknown N/A N/A

Generation VI Payback Location Purchase price XY Geosenge Town N/A ORAS Mirage Island (South of Route 134) N/A Location Purchase price Sell price SMD Kecleon Shops 1432 144

Generation VII Payback Location Purchase price SM Malie City 10,000 USUM Route 11 N/A

Generation VIII Thunder Fang Location Purchase price SwSh Hammerlocke (East Pokémon Center) 30,000