Mew.
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Lucario's pokedex number in the National Pokedex is 448.
You cannot get the National Dex in Pokemon Silver. The National Dex was only available in Generation III and above.
You can only get it in the pokewalker at the Hoenn Fields. To get this you must have 5000 watts and the national pokedex.
Shellos
Yes. You can trade Pokemon, as long as you have at least two Pokemon in your active party. I have done that, and got Chikorita in place of a Charmander. It doesn't matter even if you don't have the National Pokedex.