Question

Where is the Scope Lens in FireRed/LeafGreen?

Answer 1

Unfortunately, there is no way to obtain a scope lens through your playthrough in Firered/Leafgreen.
The only way to obtain it is through trading a Pokemon holding one to your own game.
Hope I helped:))

Comments

So can it be found in Ruby/Sapphire/Emerald (to be traded)?

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Yes scope lens can be found in R/S/E. For Sapphire and Ruby you need to take on the battle tower challenge and get a win streak of 35. For Emerald you can buy it as a reward in the Battle Frontier for 64 points.

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Thank you!