[nol]

The Battle Maison challenge, unlocked after completing the main story mode in Pokemon X and Y version, consists of trying to put together the longest winning streak against a series of random opponents. These battles are more difficult than any against the in-game opponents you'll encounter for a variety of reasons, most notably because you can't just grind your Pokemon to be a higher level than your opponents'.

However, the battles are much easier than you'd find against competent human opponents because 1) the AI is much simpler (we're a ways off from having a Pokemon version of Deep Blue) and 2) the Battle Maison trainers can use hundreds of different Pokemon, many of which are strictly outclassed by the Pokemon most often used in competitive settings.

As a matter of fact, it can be quite elementary to put together a team of the most overwhelmingly powerful Pokemon allowed that has about a 99% chance of winning any given match. Against actual people, the best of the best players typically win 80+ percent of their matches. However, if you're trying to win hundreds of battles in a row in the Battle Maison, it's inevitable you'll run into some of the game's random luck elements that will bring your streak to a crashing halt. Minimizing your exposure to luck presents a unique teambuilding challenge that requires optimization of every single element you have control over.