I just randomly found a Pokemon cross over easter egg.
We all know that in one of the PokeStar Studio Movies you get to fight a black version of Mecha Tyranitar.
Well I was randomly looking at things on Bulbapedia and I find a page called Varient Pokemon. I click on it and see one called "Black Tyrannitar" which is about a legendary like Tyranitar from the Pokemon Golden Boys Manga.
Other than the HG/SS cross over of Giovanni being Canonly linked as Silver's father, this is the second time I've seen information from a Manga be brought into the games.