But there are a lot of Pokemon in there that will give you grief if your Pokemon are not leveled high enough. Graveler, Onix, Rhyhorn, Golbat, and Ursaring (Gold) or Dohphan (Silver) are what you will find in here.

Strangely enough, when I was playing and leveling up my Pokemon before I battled the Elite Four, I ran into a shining silver Rhyhorn. It, like all Shiny Pokemon, has a constant DV of 10 for every stat (except for HP which has a DV of 0), making its total stats be somewhat higher than regular Pokemon. Whenever it goes into battle it sparkles like the Red Gyarados, and as you can see in its stats, it has 3 stars next to it's gender like the Red Gyarados.

Click here for a map.

The best place to do this is at the end of Victory Road where the exit is because you can go up to Indigo Plateau to heal your Pokemon. But before you reach the end your Rival will battle you one more time.

Now when your Pokemon are about level 50 or so I think it is a good time to take on the Elite Four at the Indigo Plateau.