There's only one region in Pokemon Sapphire, and that's the Hoenn region.
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It is impossible to move a Pokemon from SoulSilver to Sapphire as the two games are from different generations, you can only migrate Pokemon from Sapphire to SoulSilver.
As in, can you catch them inside the Hoenn Region?
You can only be in the hoenn region you can travel to any other regions
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.