>>55539933They didn't canonize the protagonist from BW for the sequels. At most you have N's dragon, but even that could be left vague if somebody just says how a legendary pokemon was used to try and power the ancient weapon and leaves it at that.
They could even pull what they did for Latios/Latias in Emerald where the character looks at an image and you're given a text prompt.
>Look at the TV and say the pokemon was red or blue>Look at some team flare research notes and say the sketch looks like a tree or an eggNot really that difficult.