There are a total of eight Legendary pokemon legitimately obtainable in White alone: Victini(Liberty Pass), Kyurem, Zekrom, Thundurus, Landorus, Cobalion, Terrakion, and Virizion.
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There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.
I don't now but I believe that you can catch as many as you want when you encounter them.
No not every pokemon. You can't catch the starter Pokemon and many of the rare pokemon, you have to trade with Diamond. sorry ...
Find a Flying-type Pokemon and catch it. There are plenty of them in each game and many Flying-type Pokemon are common Pokemon, so you shouldn't have trouble doing so.
20%.