I'm a little divided on this addition to the games. Battle Frontier it ain't nor is it PWT with near enough every gym leader showing their face. Instead we get a sprinkling of some of the more popular characters in Pokemon fandom. It's also not entirely robust in the variations of battles modes with singles and doubles being all there is.
Still got the lovely/horrible computer hax with making everything possible go wrong against you at worst minute. It's at least another time sink after completing the main game. I'm focusing my attention on completing this, starting with singles.
At the moment i'm using the following with some success (no losses as of yet!):