Maybe you have to have a great move on your pokemon
in elite 4.
After you defeat the elite four on Pokemon sapphire you complete the pokedex and make all your Pokemon level 100.
starter lv.60
5-100
good luck, i douth it.
if it is the first time you are fighting elite 4, the strongest is lvl 63, your rival's starter pokemon. Hope ive helped
you defeat the elite four by training a particular Pokemon and getting it to a high level(e.g. lv64) you also give it the best four moves that you have. try to give it moves that have a lot of pp though because you need to defeat the elite four who have a lot of Pokemon!
probably the bicycle route, or the victory road if you get there, or exp.share in the elite four
1. Give it exp. share. 2. Kill Pokemon. 3. When battling, switch pokemon and defeat it.
train your pokemon up to level 80,90, or 100 and teach it TMs and HMs
it is easy just keep beating the elite four
high leveled legys around level 65