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I'm not sure this theory is true. Today was the Battle Pyramid's day and whilst this time I got the Gold symbol the pyramid itself was no different to last time I was on time 10 in the battle pyramid and it wasn't the pyramid's day. There were exactly the same wild Pokemon and exactly the same trainers with exactly the same Pokemon as last time. There was no different in amount of items or anything else.
I think its how they battle. So say for instance, its the pyramids day, and you have a swampert, and they have a shiftry, they wont use grass attacks on you. So that the could take you out easy as, but instead they use moves like pursuit.