Before you can claim the title of Pokemon Master in the Unova Region, you must first defeat the Elite Four and the Pokemon Champion.
The Elite Four of the Unova Region are no push overs. Their team of Pokemon are actually more balanced and uses different types of Pokemon. Make sure that you’re well equipped with Potions and other items that will aid you in this battle. Remember that once you enter the room where the first Elite Four is, the battle will be continuous. No Pokemon Center is here to heal you!
Below is the little strategy guide on how to beat the Elite Four of the Unova Region.
ELITE FOUR SHAUNTAL

Shauntal’s team of Pokemon uses mainly Ghost-type Pokemon. When it comes to a Ghost-type Pokemon, they’re basically weak to both Ghost and Dark-type attacks. If you have a Ghost type TM, teach it to a Normal type Pokemon.
Pokemon Used: Cofagrigus, Jellicent, Froslass, Golurk, Drifblim (Lv 71), Chandelure (Lv 73)
ELITE FOUR GRIMSLEY

Grimsley’s Pokemon are all Dark-type Pokemon. To all of his Pokemon except for Drapion, using a Fighting-type moves will be very advantageous in this battle. For Drapion, use a Ground type attack.
Pokemon Used: Sharpedo, Krookodile, Scafty, Liepard, Drapion (Lv 71), Bisharp (Lv 73)
ELITE FOUR CAITLIN

Majority of Caitlin’s Pokemon are Psychic type while Metagross and Bronzong are mixed with Steel type. For both of these Pokemon, using fire or ground-type attacks will be very effective. As for the rest of the psychic Pokemon, using a Bug, Dark or Ghost type attacks will take them down very easily.
Pokemon Used: Musharna, Sigilyph, Bronzong, Reuniculus, Gothitelle (Lv 71), Metagross (Lv 73)
ELITE FOUR MARSHALL

The last Elite Four that you will be facing likes to use Pokemon with fighting type attacks. To easily taking down this last Elite Four, using Flying and Psychic move attacks will be the choice you will have.
Pokemon Used: Breloom, Throh, Toxicroak, Meinshao, Sawk (Lv 71), Sawk (Lv 73)
CHAMPION ALDER

With the Elite Four now defeated, you only have trainer to defeat and that is the Pokemon Champion, Alder. When it comes to Alder’s Pokemon, his team is pretty much well mixed. The type of attacks that your Pokemon should carry are the following; flying, fire, rock, ground, and dragon type.
Pokemon Used: Accelgor, Bouffaiant, Escavalier, Druddigon, Vanilluxe, (Lv 75), Volcarona (Lv 77)
Pokemon Black & White - The Elite Four of Unova Region Strategy,