Here we go:
Dragonite: Currently on my HGSS, but considering dropping it (or dropping Pidgeot, making D-nite my flier, and adding a Gastrodon). Like many have said, it lacks the streamlined elegance of Dratini and Dragonair. Frankly, it resembles a fat Charizard.
Tyranitar/Salamence: Both cool, but I just can't get past the fact that they both missed an opportunity for a kickass mid-level stage and stuck us with weird pupal stages. Overt metamorphosis references are for the early level bug Pokémon, not pseudo-legends.
Metagross: I love Metagross. Love it love it love it. I'd love it more if it were a more unique type combo (but it's a combo I love enough to have a Bronzor/Bronzong on my first ever Diamond team). What keeps it from being my absolute favorite is, again, a missed opportunity: as frustrating as it'd be, I would go nuts if the game mechanics matched the Pokedex method of evolution: i.e., if you needed two Beldum in your party to get a Metang, and two Metang to get a Metagross.
Garchomp: I love Chevy Chase's run on Saturday Night Live. If you don't know what I mean, I'll just say this: land shark. I also love that it's clearly based on a sea creature, but not constrained to being a water type. They need to do that more.
Dragonite: Currently on my HGSS, but considering dropping it (or dropping Pidgeot, making D-nite my flier, and adding a Gastrodon). Like many have said, it lacks the streamlined elegance of Dratini and Dragonair. Frankly, it resembles a fat Charizard.
Tyranitar/Salamence: Both cool, but I just can't get past the fact that they both missed an opportunity for a kickass mid-level stage and stuck us with weird pupal stages. Overt metamorphosis references are for the early level bug Pokémon, not pseudo-legends.
Metagross: I love Metagross. Love it love it love it. I'd love it more if it were a more unique type combo (but it's a combo I love enough to have a Bronzor/Bronzong on my first ever Diamond team). What keeps it from being my absolute favorite is, again, a missed opportunity: as frustrating as it'd be, I would go nuts if the game mechanics matched the Pokedex method of evolution: i.e., if you needed two Beldum in your party to get a Metang, and two Metang to get a Metagross.
Garchomp: I love Chevy Chase's run on Saturday Night Live. If you don't know what I mean, I'll just say this: land shark. I also love that it's clearly based on a sea creature, but not constrained to being a water type. They need to do that more.