For all of the main Pokemon games since Pokemon Red and Blue, and all the way to today's X & Y, are the games in chronological order?
I'm genuinely curious as to if there's an storyline spanning through all the games? So in this case, assuming it goes R,B,Y --> LG,FR --> Ruby, Sapphire, Emerald --> Pearl, Diamond --> Black, White --> X & Y? Or is it assumed that each game (in each respective region) happens right alongside other the games, timewise?