I stopped playing pokemon games or watch the show after they showed the 151+ onwards just didn't appeal to me. However if they made a MMORPG pokemon for the Wii its a must buy.

Only beat these 3
Pokémon Blue
Pokémon Yellow
Pokémon Stadium
does Pokemon Snap count ? it was a pokemon game >.>

Probably:
Blue, Red, Yellow
Gold, Silver, Crystal

then I stopped playing

In that case.

Pokémon Ruby

Pokémon Sapphire

Pokémon FireRed

Pokémon LeafGreen

blue
yellow
silver
crystal
saphire
diamond

I'm working on my first one. About 1½ hours into Red with 3 pokemons. =P

All of them

Red
Yellow
Gold
Blue
Pokemon Snap

-Gold versions, clocked over 999 hours before the timer maxed out
-Ruby version
-Pearl version

@Jake the fake HOLY HELL 999hours that prob more than i played the lot of them, i remember seeing something like 150 hours on silver, but that my friend is insane.

and moments like this i wanna watching the first season of pokemon ;(

I've played the core ones about 400 hours each.
The expansion ones about 200 hours each.

Ruby I played for about 700.