No, you do not have to face the Elite 4 twice in Pokémon Black but in the event of wanting to face Alder, the Pokémon League Champion then you will need to face them twice since you will not be able to battle Alder the first time through.
To face the Elite 4 a second time, you need to have: Met with Lorelei on Island 4. Completed the Ruby/Sapphire plot (involving Rockets.) Lorelei will return to the Elite 4 and you can then face them again.
1pkmon:80 6pkmon:50-60
It means that your Pokemon had Pokerus.
as a seen Pokemon just face the fourth elite four at the Pokemon league. as a caught Pokemon you need to trade a kadabra over and back.
You have to catch a Feebas first and then get its beauty up to 100 or face the elite four.
Beat Pokemon trainer red on top of mt silver. you can only face him once you beat all 16 gyms and the elite four twice.
An elite four is four elite Pokemon trainers who, after you get all eight badges, should be waiting to face you. These are four of the strongest trainers you will battle, unless there is a fifth person (rival) who you will have to face one after another with no Pokemon centers or poke marts.
Face the elite four.
You go to this one room where you face your enemy who also has beaten the elite four then you face him and if you win you become Pokemon champion
they should be lvl 55-62
I believe you face the Elite 4 again.
in your but
a lot of Pokemon with very high levels :)
You can catch Pokemon after the storyline at route 10 or you can face the elite 4 many times u can use a lot of rare candies
face it twice
To face the Elite 4 a second time, you need to have: Met with Lorelei on Island 4. Completed the Ruby/Sapphire plot (involving Rockets.) Lorelei will return to the Elite 4 and you can then face them again.
1pkmon:80 6pkmon:50-60