The starters that should definately be in it are:
Charmander, Cyndiquil, Torchic, Chimchar,
Squirltle, Tododile, Mudkip, Piplup,
Bulbasaur, Chickitoria (Buffed, of course), Treeko, and Turtwig.
The reason is that there starters. I don't really count Pikachu as a starter due to the fact that he was only one in Yellow, a special version of red and Blue. If you put him as a normal starter, you should put Eevee as one as well. In my opinion, as the only electric Pokémon, he should be a special Pokémon. You know, the ones you can't pick as your starter. The special one should be:
Cubone (I liked playing as him in RRT), Eevee (This is one of the most popular Pokémon ever, seriously), and Pikachu (Not a normal starter though, as reasons I put above).
One that might be good for the job as special starter:
Ralts (Just we a little move change), and Riolu (Perhaps, he's cool, popular and awesome. But may be a little to powerful. I mean, in that movie 'Lucario and the Mystery of Mew', Lucario was pretty much portrayed as a LEGENDARY Pokémon. Riolu is the Pokémon that evolves into Lucario)