Here is the list of all the Pokemon games I own and a little rambling undereathe of my thoughts on them. =w=
Yellow Verison
Even though I am no longer in possession of this game (I lost it), it was the first Pokemon game I ever owned. I loved the fact that Pikachu was right following behind you outside it's Pokeball because s(he) didn't like it's pokeball. I think they need to bring back that feature aside from when in Diamond/Pearl verison when going into the park.
Blue Verison
I brought this game at Game Stop a while back, and whoever owned it previously had a pretty decent team. I only got to enjoy it for a while. Mysteriously, the game had disappeared and it would not let me start a new game. I am considering to throw it out but it's mostly just sitting in my room collecting dust.
Silver Verison
I consider this game to be my second oldest from Yellow. The game on it own, I worked hard to raise an eevee and have it become an Umbreon (which I have the nickname "Night" in japanese). It's probably why I haven't started a new game yet.
LeafGreen Verison
This verison reminded me of the original verisons like Yellow and Blue, but extended in that there was other places to visit (such as the islands) and new people to meet. It still has that classic flair but with a slight twist. <3
Sapphire Verison
The contest aspect of the game is my favorite, for there were times when I would play it just to enter one of my pokemon into a contest. I found it amusing that no matter how many times I entered, the other entries are usually the exact same from a previous contest (as though they never actually moved on even though the said person had own from another contest I had entered). xD;;
Mystery Dungeon (Red Rescue Team)
This game is so much fun. I love how you get to be a pokemon yourself, battling and learning new attacks. Also how everything is run by Pokemon (the shops, bank, training ground).