Heh, so I just watched BW020, and I was impressed to find that they left in the music that played just after Krokorok evolved. The instrumental version of the Best Wishes opening, to be exact. I honestly thought they'd change it. Cool beans.
Apparently there was an edit to the music at some point earlier, according to bulbapedia. But I didn't notice and it all sounded like game music, so no problem there.