The infamous “1997 Spaceworld beta” version of Pokemon Gold and Silver has a sprite for Imposter Professor Oak in the game. It seems that the character was originally part of Pokemon Gold and Silver‘s ...

I've spent more hours in the fourth generation Pokemon games than any other game I've ever played, but I can safely say that I've never seen this obscure post-game feature, nor do I think I ever will.

These games with excellent world-building will make you think about the worlds these Pokemon inhabit on a deeper level.