Which was the best Pokémon game and why.

[Arjahn]

I agree with Metal on this one, Leaf Green and Fire Red were awesome and brought us back to Kanto perfectly. Plus we got a lot of sweet new items (VS seeker was a Godsend), new sidequests, new battles, a ton of new content that felt way more natural than Ruby and Sapphire, plus we could get back to using the original 150 instead of the newer Hoenn ones, no offense to salamance or anything, but I think a lot of us really missed them by that point.
Also, I'm still in love with the fact that we can still transfer our pals from way back in 2002 to the newer games 10 years later, which is awesome.