You need to beat all the 8 gym badges. I have just completed the 8 badges and my Pokemon are all around lv. 65 (well... at least 3 of them are!). I hope this helps
they are in the Pokemon league.
The Elite Four
The rare Pokemon which you can get before the Elite Four in Pokemon Platinum are Giratina, Mesprit, Uxie, and Azelf.
Pokemon league.
The last person of the Elite Four in Pokemon Platinum is Lucian, the master of Psychic-type Pokemon. After him is Cynthia, the Champion.
I think its Bertha of the Elite four.
40s and 50s
you beat the elite four
Behind the ELite FOur place.
No. You need to beat the Pokemon League IN the Platinum one.
only if you have the catch trainers Pokemon code
you can transfer Pokemon from Pokemon platinum to black and white but you can't trade from black to platinum