BeachBoy was saying something about wanting numbers so I did a little looking and made a couple of graphs
because I have nothing better to do. Numbers were pulled from
this page.
Keep in mind that when I grouped them by generation it was like:
Gen1: Red/Blue/Green/Yellow (4 games)
Gen 2: Gold/Silver/Crystal (3 games)
Gen 3: Ruby/Sapphire/Emerald/FireRed/LeafGreen (5 games)
Gen 4: Diamond/Pearl/Platinum/HeartGold/SoulSilver (5 games)
Gen 5: Black/White/Black2/White2 (4 games)
Gen 6: X/Y/ORAS (4 games)
Interpret that all how you will.
And this page confirms what he was saying about
X/Y being the best selling 3DS games so far, with them beating out other high profile games like Mario Kart 7, Smash Bros 3DS, Animal Crossing New Leaf, Ocarina of Time 3DS, etc. ORAS are the 3rd best-selling 3DS games as of now.
There's obviously still the spinoffs, TCG, anime, manga, and merch to cover, but I'd figured that'd be a decent start.
edit: Just gonna post the link again that
Boss Salamence posted earlier about the Pokemon TCG apparently basically being one of the top 3 selling TCGs in the world as of Spring 2015 (ty for that btw):
https://icv2.com/articles/markets/view/32100/top-collectible-games-spring-2015