i think your talking about brendan just restart the game and be a girl then he well be your rival.
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Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
After you get the 4th badge go to petalburg city and enter the gym go through it then fight Norman for your 5th badge.
Evee is not availiable in Pokemon Sapphire.
sinnoh Pokemon won't appear in Sapphire version!
There is not a bike voucher in Pokemon sapphire