Is there an order to the Pokemon games chronologically?

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?

Solution 1:

As usual, Bulbapedia holds the answer:

(Fire) Red, (Leaf) Green, Blue and Yellow, as well as (Omega) Ruby, (Alpha) Sapphire and Emerald, are all simultaneous.

Three years later, (Heart) Gold, (Soul) Silver and Crystal, as well as Pearl, Diamond and Platinum happen.

Some time later, the events of Black and White transpire, and two years later, Black 2 and White 2 happen, contemporaneously to X and Y.