Game Freak likes to do these things, also known as Easter Eggs. They can reference other companies, other parts of the series, and more.
For example, if you received the Shiny Beldum event and you have it in your party during the Delta Episode, at some point or another Steven says you remind him of a young man with a black Charizard. This references Alain and his Mega Charizard X from the Mega Evolution Special on TV. A hiker in Pokemon X and Y also references Colress from Black and White 2.