i tried it with this team
flygon 45
scptile 36
torkel 35
manektrik 36
and herocross
After you defeat the elite four on Pokemon sapphire you complete the pokedex and make all your Pokemon level 100.
Defeat Brock and then Roxanne and then roark it will easily level up your pokemon.......
use a weak poekemon in battle
Repeatedly battle the Elite 4 with high level Pokemon with the Pokemon you want to level up holding an exp. share.
To defeat or "beat" the 7th gym leader in Pokemon sapphire there twins and they have a solrock and a lunatone to beat them I suggest about level 40-50 water types.
In Pokemon Sapphire version in the beginning of the game between LITTLEROOT town and OLDTALE town there is Poochyena in the grass. The Poochyena's are level 2-3 so it is really weak. Try training your Poochyena to get it to the level you would like it to be. (If you would like to battle the Elite 4 then train your Pokemon [all your Pokemon] to be level 70 for a clean battle or level 60 for a evenly matched battle, of course the Pokemon in the Elite 4 are only about level 55 they are trained to be more powerful than regular Pokemon.) Good luck and I wish you have a good battle!
You must defeat the Elite Four and go to Sky Pillar and there you will find Level 35-40 Claydols
U dont get prinpulp in pokemon sapphire!!!
My Pokemon to defeat Iris were Level 45.
Level 35.
Level 40
level 7