I used to quite like Flygon. I don't like Trapinch much but I love Vibrava and by extension, its evolution (since I dislike leaving unevolved Pokémon on my team).
When Garchomp came along, I never paid it much mind, but when I was raising a Gible to fill out my Pokédex, I took quite a liking to it and now whenever I need a 6th on my team in Diamond (I typically only have 5 things), I grab my Garchomp from the box. :) It's really grown on me and I think I'd say it's one of my lesser favourites by now.