Firstly, you have to go to Goldenrod City. Go on the very west of Goldenrod City where there is a really big building. That is called the GTS. You can trade there.
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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.
You Can Not Catch Celabi In Pokemon Firered Unless you trade with pokemon heartgold or 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.
You'll need to trade for it from Pokemon HeartGold. It is not avilable in the wild in Pokemon SoulSilver.