You go to GoldenRod city and on the right of all the shops theres a bike shop
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In goldenrod city
above the bike shop in goldenrod
In Goldenrod City. There is a house you pass when going to the bike shop.
Get to the byke shop in Goldenrod city, Then he will give you a free byke Hope it helped , Kruh
There is not a bike voucher in Pokemon sapphire