here is how CRASH YOUR GAME RIGHT NOW IF YU WANT IT
Hey you guy, he just asked a question! let me answer to your question, and ignore this stupid dude's respond. You can't get it free, but you can purchase the TM15 Hyper Beam in the Celadon City Mart. Hope I helped :)
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Hyper Beam.
Gyarados learns Hyper Beam at level 50.
He never does. Luxray is a physical attacker, why on earth would you want Hyper Beam on it ??
You can't get it in Pokemon Crystal. Though there are Pokemon who can learn it like Dragonite.
Hyper beam is a normal type move, normal type moves don't effect ghost types at all. In other words, Ghost types are strong against Hyper Beam.