My Rayquaza was at the following status when I turned it Mega
- Above 131k attack (I think around 140, I honestly don't remember exactly)
- 50.04 EV bonus = 1.5x bonus
- Held item = Sharp Beak = 1.2x bonus
Upon turning mega, it dropped down to 115k attack showing the same bonuses which should be impossible, attack should increase.
I am attaching my current save with the Rayquaza Mega'd and an older file from a couple days ago from before. I had not fully completed the EV'ing process yet in the older file, and RayQ is only at around 95k. I apologize I don't have a save that's more recent than that prior to the issue.