I have to say my favorite pokemon is swampert.
In my first pokemon game (emerald) I got a mudkip, as that was the only pokemon that I knew at the time. I didn't really know how to play, so I took that mudkip, and raised it to 100 after many hours of gameplay. (All my other pokemon were under 10) One day, my friend had trouble at the fourth gym. He said (yelled) to me, "TRADE ME YOUR SWAMPERT OR WE AREN'T FRIENDS ANYMORE!" I traded him my swampert. After he left (with my swampert) he "lost" his game because it was "ran over" by a "car" in the street. I never got my swampert back. The good news is, we aren't friends anymore.
RIP Warrior