Lets make this thread actually Pokemon related so it doesn't get pruned. Why are your choices your favorites?
>Gen 1
>Gengar
I have always loved Gengar. I have never had a Gengar however. I had a plushie and a small Gengar figurine as a kid, and they were my all time favorite things. I didn't manage to actually get a Ghastly until Soul Silver, where I found that I actually love the line in general.
>Gen 2
>Typhlosion
I had a Bayleef in Crystal. I eventually traded it for a Totodile. I saw my rival had this cool Pokemon, and I was interested in getting it. Ash's Cyndaquil in the anime was always really cute too, so that really endeared me to the Pokemon. Eventually, when I played Mystery Dungeon, I ended up getting Cyndaquil, with Totodile as my partner. I felt like I bonded a lot with the Pokemon, and then later on, I decided to get one in Soul Silver. Best choice ever right there.
>Gen 3
>Sceptile
I started with Mudkip on Ruby. Loved it. Lost the game eventually, and ended up getting Emerald. I got a Treecko this time, and it honestly ended up being a massive bro.
>Gen 4
>Drifblim
I'm a pretty big fan of ghost types, and while there weren't many Pokemon I cared for Gen IV, the Drifloon line stood out. It was really cute, and surprisingly useful. It was on my team the entire game.
>Gen 5
>Galvantula
OH BOY HERE WE GO. I've got a thing for both Electric Types, and Bug Types, not to mention spiders in general. So, eventually I saw this cute little spider bug, and I decided that it was going to be on my team no matter what. Great coverage, and some pretty cool moves. I gave it Signal Beam, Volt Switch, Thunder, and Electoweb, and I was pretty much all set.
I got one again in Gen VI, and it's probably my best Pokemon, shrugging off Earthquakes, slowing down entire teams, and constantly, and faithfully striking down anything that moves with Thunder.
>Gen 6
I just really, really love it's design. It's a goddamn giant soundwave fruit bat. Oh, and it can get Infiltrator.