You have to trade one from Emerald.
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Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Evee is not availiable in Pokemon Sapphire.
You can catch them while they're in swarms. Otherwise it's almost impossible and will take you weeks non-stop. To get Pokemon in swarms you need to listen to the radio on your pokedex and wait for it to say where the snubull is swarming.
sinnoh Pokemon won't appear in Sapphire version!
There is not a bike voucher in Pokemon sapphire