Since I own all Generation III games, I plan to get all the Pokémon that can be captured, and bring them to Emerald. In Emerald, I plan to bring them up to level 100. Mainly, the Pokémon that I won't have are some of the legendary Pokémon, and two of the Johto Starters.
PC (as of January 29, 2012 9:16 pm)
And that is all that I have for this moment in time. I will be updating as fast as I can.