Hi Jump Kick
With this team i could be champion
Actually you need to notice that this is for Elite Four, not Champion.
Besides, I already BECAME champion with an elemental team.
Your team is quite good, however please state why you have the moves so you don't try breaking the Detail Rule.
I'll only give information on Charizard, because it's Night-Time here.
-Heat Wave so it can wipe out enemies fast - Also a strong move.
-Dragon Pulse because of, everything. Charizard needs to wipe out those who are resistant from Heat Wave.
-Solarbeam (Power Herb) because then, it could give a one-turn of striking those who are strong against it, likely fainting it.
-Earthquake because it needs a Physical move to deal with Special Walls and it could be very strong.