I hope in the next Pokemon the legendary Pokmon like this are free DLC so they aren't revealed by digging through the games files. They have got to be aware the current system holds no surprises. Imagine how exciting all these 'post-release' Pokemon would be if we had never known about them until they were officially revealed.
Well yeah, it would be more neat to see them revealed as intended..but to be honest, I think if an event pokemon is singled out for its reveal, most of the reaction on forums and similar would just be the usual "it looks like digimon/they are running out of ideas" nonsense xD