Imagine if you actually got experience from winning battles! wouldn't that be awesome?!
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Train Your Pokemon- (Train till level 60 above,sure can one)
A good place train is the route next to Undella town. You can put exp. share on a weaker Pokemon let a stronger Pokemon do all the work and you will level up quickly because the Pokemon there are usually about level 50-60. Another way is by using the daycare to level up fast by just using your bike or running to level up.
After you get six badges.
Tyranitar
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!