I'll be getting totodile to start, as since you get 3 sets of starters to choose from, one things for sure is im getting the two most powerfulest as far as fully evolved pokemon are, Sceptile and Charizard, and theres no way i will go without a water one, even though i believe Feraligatr is the weakest, i cannot pick Blastoise over Charizard or Swampert over Sceptile, so its gonna have to be Feraligatr, besides atleast i'll have the surfer at the beginning. Anyways the team that i will have for the johto area will be as follows:
1. Feraligatr
2. Jolteon
3. Gengar
4. Alakazam
5. Marchamp
6. Arcanine
That should be the team that i will pit against the Elite Four, after that i imagine you should be getting the National Dex so even though i don't really have any plans of what my team will be after that, i'll pretty much have the entire dex to choose from.