you get given it by the power plant boss in kanto after getting back the bit has been stolen
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It learns Hyper beam on lv. 57.
TM57 Charge Beam can be won on Wednesday in the Goldenrod City Dept. Store lottery, and is also located in the Power Plant and in Olivine City.
It's available as a prize at the goldenrod city game corner.
what's a charge beam anyway!
Luxray does not learn charge beam by itself, you must use TM57, which holds charge beam, on your Luxray.