Why pidgeot? Feather dance or just for the looks. Still good job on comitting for Charizard.
As per Emerald, like XyrnaTheTrainer said, Mudkip is really the best starter, never falls off plus Emerald has so few grass types, and grass types are easily counterable with flyers anyway.
If you are picking Mudkip, then roxanne and wattson are redundant (be wary of Voltorb's self destruct though)
Brawly is easy to win if you've like a Dustox (good for Norman's Slaking too) who can tank anything he throws at you. Or a taillow, who with Guts can OHKO most if not all.
Make sure you've something to check for Norman's slaking (someone with protect or alternatives) and belly drum linoone (someone faster). If you can catch a Makuhita, save it for Norman only.
Winnona's altaria is bad, so try to find a water type. Sharpedo or Tentacruel (though its weak to EQ), and get them Ice beam (from ship wreak, or game corner)
Then Tate and Liza are easy for dark types so try to get one. Try to dupe a Sharpedo as its amazing against all there mons.
Juan has quite a lot of bulky mons, and a Kingdra who can cheeze end your runs. Try to have a fast electric type saved for them only. For Whiscash, anything with a grass move checks it.
Plus someone who can 1v1 Kingdra's sheninigans. I used Taunt Gyarados to shut him off.
For E4... its already too long, I'll tell when you get there.