Well my fav. Pokemon is Dragonite. But I also like Tyraniter a lot.
Tyranitar is awesome.
When I still played the gameboy games I lived in a little rural town so I had the grand total of 2 people to play with. One of them was pretty much my best mate at the time, he'd name his rival in the games after me and I did the same for him. Admitedly, we weren't
that good and we tended to have the same sort of party. So here we are with a lugia, charizard and mewtwo, he eventually finds a counter, tyranitar, dark/rock and his moves were great against those ones. So then I get one too and our battles from then on were bring out our tyranitars and try and kill the other first. I think we needed more kids with gameboys to show us why this is a bad idea, haha.
My favourite was my charizard, but the one I used the most was mewtwo.