That mamo lead game was so infuriating to watch because the opponent won due to glitches and lag. To start he had like 2 fast moves ahead, then it stuttered again and Xerneas lost another fast move, which would have allowed xerneas to win lead, but what nailed it was the stutter with Lando against dialga so he does not get the sandsear, and then right after gets denied an incinerate which would have allowed him to reach BBird and win.