The people organizing the European Pokémon tournament are proving to be extremely strict with competitor paperwork, as they've pulled a handful of people from participating due to minor mistakes on their sign-up sheets.
For example, one competitor had mistakenly wrote that his Pokemon was holding a Miracle Seed instead of a Meadow Plate. This minor mistake lead to the player losing the ability to use that Pokemon, and also was given a game loss.
It seems that hackers using a Battle Box glitch are why the organization is being so strict with paperwork. They're on the lookout for players using a glitch that lets them change stats, items and moves at any time. When the paperwork discrepancies turn up, swift action is taken, even if it's just a simple transcription mistake.