Ash has lost all 4 tournaments in BW. The fact that the writers didn't let him win a single one is quite bizarre.
He then barely scraped a win against Homika by using 6 pokemon, and he didn't battle the toughest Gym leader of the region which was Drayden. His Pokemon team is one of the worst handled in the shows history and his rank in the league was worse.
What did Ash accomplish in BW? It's like the writers destroyed 13 years of development in the span of 2 years.