Yea, I need it for rock tunnel. at later gens flash become something that only makes exploring a cave a bit more easy, but in gen 1 its pitch black if you dont use it. I guess you can find your way with or without it, but I prefer using it and save myself the troubles of getting lost in the dark XD
If you don't want to go through the trouble of catching a Pokemon for one HM that you won't need again, it's probably best to just look at a map of the cave:
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Topic: Cant teach flash to any pokemon (blue)
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