Dude.....this is Pokemon. This is an anime and a game that is pretty much targeted to a youth audience. it doesn't really matter how many older people play it, children are its target audience. The writers of the franchise don't have to check themselves for that very reason. They are allowed to do whatever they want because children aren't going to care. Will the older people care? Obviously. But our criticisms are merely academic at this point.
Maaan...if you pointed out every continuity error in the Pokemon franchise, you would come to the same conclusion. The writers just don't care. I just pretend that every season. game, and movie of the franchise takes place in a separate alternate universe. That helps me sleep at night....haha!