You are pretty much done with the game now. The main point of the game is to defeat all of the trainers with your own Pokemon and collect them all. You have collected all of the Pokemon, so you pretty much defeated the game.
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Lucario's pokedex number in the National Pokedex is 448.
Mew.
You can only get it in the pokewalker at the Hoenn Fields. To get this you must have 5000 watts and the national pokedex.
In Pokemon SoulSilver (and also HeartGold) Yanma evolves into Yanmega by leveling up while knowing the move Ancientpower, but only after you acquire the National Pokedex.
In the National Park.