Hahah yeah Battle Maison is janky as hell xD They don't play by anyone's rules but their owwwwn. The luck part is what makes it illegal in competitive though, theoretically you could get lucky and just hit with it way too much on a fast or bulky pokemon to ignore any strategy or skill and win. THEORETICALLY. It doesn't usually happen, buuut y'know. It has.
And sorry to hear that - but he's pretty experienced from what I can tell, and he uses a full 6 poke team of overused tryhardy level pokes. :P I bet you could beat him if you got a lot of practice in though - really I do. You should really try and get a match against Ferraligator, Adam, and um. There was one other person. But the lesser winning poeple. It'll get you some practice in. :3