Cacturne getting knocked out fast is a shame, but it is understandable. It was pretty high up when it was coming in for the Needle Arm attack, so it had no way to really move out of the way when the powerful Focus-Shadow Ball nailed it in the face. The poor little thing wasn't even able to break his fall after getting hit.
May saw that Wigglytuff was able to ride around in the air to avoid attacks, so she had Munchlax and Eevee fire their attacks behind it so they would produce an explosion which would bring it closer down to the ground. Munchlax used Eevee as a launching board to get up to Wigglytuff and deliver a strong Focus Punch right into the fluffball.
At least Wigglytuff was owning her on its own for a while until it.....tripped? I couldn't really make out what happened.
If anything about that part of the battle was wrong, it was the Munchlax bouncing off of Eevee. That little brawler weighs a ton.
It was really funny how after all the Shadow Balls/Solar Beams missed they cut to May's life-bar shooting down like mad.
Diamond Friend Code - 3265 1538 6780