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.
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yes
You can 'MIGRATE' Pokemon but, I don't think that you can trade them because the sapphire version is for the GBA and Pokemon Soul Silver is for the NDS.
Migrate from Emerald, sapphire, ruby, or trade with heartgold and soulsilver
no you can trade soulsilver pokemon to black
The only way to get a gligar in pokemon soulsilver is to trade with pokemon heartgold.