Pokémon Ruby and Sapphire/The Elite Four

These guys are the last bosses. After defeating them, you face the champion. (In Red, Blue, Yellow, Fire Red, and Leaf Green, this is your rival, who I will refer to as Gary. Gold, Silver, and Crystal have Lance as the champ. In Ruby and Sapphire, you fight Steven. You battle Wallace in Emerald.) I will cover the Elite Four from Ruby and Sapphire here.

The first of the elite four is Sidney. He specializes in dark Pokémon. He has an absol, a houndoom, a shiftry, a sharpedo, and a cacturne. The Shiftry knows Extrasensroy, so beware!

After Sidney comes Phoebe, a user of Ghost Pokémon. She has a Sableye, Two Dusclops, and two bannetes. That Dusclops knows Ice Beam, so keep Rayquaza far away from it.

Next up is Glacia, with Ice Pokémon (Duh). She has Two Glalies, Two Sealeo, and a Walrein. Make sure you have a strong Kyogre, because Walrein can use Sheer cold!

Drake, the Dragon Master, is the final of the four. He has an Altaria, Flygon, two shelgon, and a Salamence! Ice Pokémon go!

The champion, Steven, has mostly Steel Type Pokémon. Beware the Aggron, Cradily, Armaldo, Skarmory, Metagross, and something else (I forgot, i'm sorry)! Get out your Fire and Fighting Pokémon!