I'm not sure if this has been done before, but I figured as long as we have a topic about favorite dragons, we should just get all of the types out of the way. A couple of quick rules:
1. You have seventeen slots. Every slot must be filled, and no slot can be filled with two pokemon. Even if you don't like a type much, just pick your favorite.
2. No pokemon can be used twice. For instance, though Sableye is my favorite pokemon in general, I only put him under ghost and put something else under dark.
3. A Pokemon can be put under either type it belongs to, regardless of whether it's other type is used, so you can have several pokemon of one type if they fall into a different category. Think about it and see if you can fit all your favorites.

Now then, here's my List:
Normal: Togekiss
Fighting: Hitmonlee
Flying: Honchkrow
Poison: Croagunk
Ground: Dugtrio :51:
Rock: Magcargo
Bug: Surskit
Ghost: Sableye
Steel: Mawile
Fire: Blaziken
Water: Quagsire
Grass: Tropius
Electric: Manectric
Psychic: Hypno :97:
Ice: Walrein
Dragon: Gible
Dark: Shiftry

I just made a list about this on Friday

Normal Munchlax

Fighting Infernape

Flying Togekiss

Poison Weezing

Ground Mamoswine

Fire Magmortar

Bug Heracross

Ghost Gengar

Steel Empoleon

Rock Rhyperior

Water Feralagtr

Grass Roserade

Electric Electivire

Ice Glaceon

Dragon Dragonite

Dark Absol

Normal: Blissey
Fighting: Hitmontop
Flying: Swellow
Poison: Croagunk
Ground: Steelix
Rock: Rhyperior
Bug: Masquerain
Ghost: Spiritomb
Steel: Steelix again
Fire: Charizard
Water: Gyarados
Grass: Venasaur
Electric: Electivire
Psychic: Alakazam
Ice: Froslass
Dragon: Dragonite
Dark: Spiritomb again

Normal: Raticate
Fighting: Herracross
Flying: Salamence
Poison: Seviper
Ground: Donphan
Rock: Tyranitar
Bug: Pinsir
Ghost: Spiritomb
Steel: Metagross
Fire: Magmar
Water: Starmie
Grass: Carnivine
Electric: Electivire
Psychic: Alakazam
Ice: Abomasnow
Dragon: Flygon
Dark: Sableye

Wow moderator, way to read the OP.
List as of right now.
Normal: Miltank
Fighting: Heracross
Flying: Mantine
Poison: Croagunk
Ground: Quagsire (hard choice!)
Rock: Kabutops
Bug: Scizor
Ghost: Gengar
Steel: Skarmory
Fire: Quilava
Water: Mudkip
Grass: Breloom
Electric: Mareep
Psychic: Slowpoke
Ice: Spheal family
Dragon: Flygon
Dark: Houdour

Electric: LUXRAYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYy.
Normal: ARCEUS
Fighting: Toxicroak
Flying: Ho-oh
Poison: Skuntank
Ground: Gliscor
Rock: Tyranitar
Bug: Scizor
Ghost: Spiritomb
Steel: Magneton
Fire: Arcanine
Water: Feraligatr
Grass: Venusaur
Psychic: Alakazam
Ice: Froslass
Dragon: Garchomp
Dark: Houndoom

Normal: MIITANK
Fighting: Combusken
Flying: Charizard
Poison: Crobat
Ground: Larvitar
Fire: BLAZIKEN
Bug: Beedrill
Ghost: Haunter
Steel: Scizor
Rock: Lairon
Water: Squirtle
Grass: Grovyle
Electric: Zapdos
Ice: Weavile
Dragon: Rayquaza
Dark: Absol
Psychic: Metagross

Normal: Girafarig
Fighting: Lucario
Flying: Ho-oh
Poison: Gengar
Ground: Swampert
Rock: Aerodactyl
Bug: Scyther
Ghost: Giratina
Steel: Dialga
Fire: Charizard
Water: Floatzel
Grass: Torterra
Electric: Raichu
Psychic: Mew
Ice: Lapras
Dragon: Dragonite
Dark: Umbreon

SK, I'll let the Combusken/Blaziken thing slide because they are technically different pokemon.

Sunny, do you have a list to contribute?

Doooh fine. :<

Normal: Lickitung
Fighting: Lucario
Flying: Honchcrow
Poison: Serviper
Ground: Flygon
Rock: Golem
Bug: Armaldo
Ghost: Spiritomb
Steel: Empoleon
Fire: Charizard
Water: SWAMPEEEEEEEERT~!
Grass: Tangrowth
Electric: AMPHYYYYYYYYYYYYYY
Psychic: Slowking
Ice: Froslass
Dragon: Dragonite
Dark: WEAAAAAAAAAAAAAAAAAAAAAAVIIIIIIIIIIIIIIIIIIIIIIIII IIILE~!

Normal: Furret
Fighting: Blaziken
Flying: Tropius
Poison: Nidoking
Ground: Marowak
Rock: Tyranitar
Bug: Armaldo
Ghost: Sableye
Steel: Mawile
Fire: Infernape
Water: Swampert
Grass: Bayleef
Electric: Ampharos
Psychic: Alakazam
Ice: Weavile
Dragon: Latias
Dark: Mightyena

Oh my Alakazam seems to be quite popular. Have I impacted you all in any way?

Normal: Porygon-Z
Water: Milotic
Grass: Exeggutor
Fire: Moltres
Electric: Magneton :82:
Poison: Tentacruel :73:
Bug: Pinsir
Flying: Togekiss
Ghost: Dusknoir
Rock: Omastar
Ground: Hippowdon
Steel: Bronzong
Fighting: Medicham
Dark: Drapion
Dragon: Altaria
Ice: Jynx
Psychic: Alakazam

Normal: Skitty
Fighting: Heracross
Flying: Farfetch'd :83:
Poison: Qwilfish
Ground: Wooper
Rock: Shuckle
Bug: Pinsir
Ghost: Shedinja
Steel: PedoProbopass
Fire: Vulpix :37:
Water: Surskit
Grass: Bayleef
Electric: Electrode
Psychic: Slowpoke :79:
Ice: Swinub
Dragon: Shelgon
Dark: Drapion

I put Shuckle in Rock so I could have Pinsir in Bug, which puts Surskit in Water, moving Qwilfish to Poison and meaning Magikarp, Bibarel, and Swalot cannot be included. :3

Normal: Eevee
Grass: Bulbasaur
Fire: Blaziken
Water: Lapras
Electric: Pikachu
Psychic: Gardevoir
Ghost: Spiritomb
Dragon: Salamence
Fighting: Hitmonchan
Flying: Pidgeot
Ice: Swinub
Ground: Dugtrio
Rock: Onix
Poison: Seviper
Bug: Pinsir
Steel: Metagross
Dark: Sableye

Normal: Furret
Fighting: Gallade
Flying: Togetic
Poison: Crobat
Ground: Sandslash
Rock: Pupitar
Bug: Venonat
Ghost: Giratina Altered Forme
Steel: Magnemite
Fire: Cyndaquil
Water: Not that stupid Wotter >:^D Uh, Starmie I guess
Grass: Tsutaaja
Electric: ROTOOM~!
Psychic: Latias <3
Ice: Glalie
Dragon: None, they're all overrated. But in a serious pick, I guess I choose Altaria
Dark: Absol
Bird: MissingNo

Normal: (Eevee is cute, but Aipom is wininin!
Fighting:
Flying:
Poison:
Ground:
Rock:
Bug: :13:
Ghost:
Steel:
Fire:Erm..
Water:
Grass: ::turtwig:
Electric:
Psychic:
Ice:
Dragon:
Dark:
Bird: 'M

Normal: Eevee
Fighting: Machamp
Flying: Staravia
Poison: Crobat
Ground: Larvitar
Rock: Golem
Bug: Shedinja
Ghost: Giratina Origin Forme
Steel: Magnezone
Fire: Charizard
Water: Squirtle
Grass: Tsutaaja
Electric: Luxray
Psychic: Abra
Ice: Froslass
Dragon: Bagon
Dark: Absol
Bird: MissingNo

Normal: Furret
Fighting: Lucario
Flying: Swellow
Poison: Nidoking
Ground: Rhyperior
Rock: Tyranitar
Bug: Scizor
Ghost: Gengar
Steel: Dialga
Fire: Typhlosion
Water: FLOATZEL
Grass: Sceptile
Electric: Luxray
Psychic: Slowbro
Ice: Weavile
Dragon: Salamence
Dark: Umbreon

Normal: Eevee
Fire: Flareon
Water: Vaporeon
Electric: Jolteon
Grass: Leafeon
Ice: Glaceon
Ground: Sandslash
Poison: Crobat
Fighting: Riolu
Flying: Togekiss
Rock: Cradily
Bug: Forretress
Psychic: Espeon
Ghost: Dusknoir
Dragon: Flygon
Dark: Umbreon
Steel: Lucario

Eeveelutions rock. If you don't want pokemon in the same evolutionary line, sorry. The only one I'm willing to swap would be Riolu for Mankey... that crazy little pig-monkey .

pokemon from the same evolutionary line are fine, I only object to using the same pokemon twice or not filling a space.

Normal: Togekiss
Fighting: Hitmontop
Flying: Swellow
Poison: Drapion
Ground: Donphan
Rock: Tyranitar
Bug: Armaldo
Ghost: Gengar
Steel: Agron
Fire: Charizard
Water: Ferralagatr
Grass: Leafeon
Electric: Manetric, Jolteon or Ampharos not sure
Ice: Weavile
Dragon: Dragonite
Dark: Umbreon

**Note** They are all on there last evolve.

Normal: Swellow
Fighting: Lucario
Flying: Togekiss
Poison: Roserade
Ground: Torterra
Rock: Aerodactyl
Bug: Butterfree
Ghost: Gengar
Steel: Skarmory
Fire: Entei
Water: Lapras
Grass: Grovyle
Electric: Jolteon (overall favorite)
Psychic: Uxie
Ice: Articuno
Dragon: Dragonite
Dark: Absol

Honorable Mentions (ones that I like but didn't make this list):
Latias, Glaceon, Gardevoir, Electrike, Crobat

Some of these were easy, like Normal, Water and Fire, but ones like Steel and Ghost I had to look at the list of Pokemon by type and choose.

Normal: Furret
Fighting: Riolu
Flying: Salamance
Poison: Croagunk
Ground: Garchomp
Rock: Larvitar
Bug: Butterfree
Ghost: Spiritomb
Steel: Aggron
Fire: Bakuphoon
Water: Buoysel
Grass: Leafeon
Electric: Riachu
Psychic: Lugia
Ice: Glaceon
Dragon: Dragonair
Dark: Mightyena

Normal: Munchlax
Fighting: Hitmonlee
Flying: Pidgeot
Poison: Gengar
Ground: Larvitar
Rock: Golem
Bug: Ariados
Ghost: Sableye
Steel: Steelix
Fire: Infernape
Water: Swampert
Grass: Turtwig
Electric: Raichu
Psychic: Espeon
Ice: Abomasnow
Dragon: Dragonite
Dark: Darkrai

Normal: Castform
Fighting: Lucario
Flying: Charizard
Poison: Nidoqueen
Ground: Groudon
Rock: Larvitar
Bug: Shedinja
Ghost: Misdreavus
Steel: Empoleon
Fire: Ho-oh
Water: Suicune
Grass: Bayleef
Electric: Luxray
Psychic: Latias
Ice: Lapras
Dragon: Dialga
Dark: Houndour

Normal:
Fighting:
Flying:
Poison:
Ground:
Rock: :76:
Bug: :49:
Ghost:
Steel:
Fire: :38:
Water:
Grass:
Electric:
Psychic: :97:
Ice:
Dark:
Dragon:

Normal: Snorlax
Fighting: Blaziken
Flying: Swellow
Poison: Gengar
Ground: Flygon
Rock: Golem
Bug: Scyther
Ghost: Froslass
Steel: Aggron
Fire: Rapidash
Water: Starmie
Grass: Roserade
Electric: Electrode
Psychic: Gallade
Ice: Glalie
Dragon: Latios
Dark: Sableye

Made a mistake, I meant to put magnezone, not electrode! Heheheh...

I believe you made a mistake, YOU must have seen sableye and swellow as the same pokemon! "You has been PWNED"

Forgive me, I mixed you up with Sergei, he had two honchkrow. But he fixed his post, so all's good.

Normal: Snorlax

Fighting: Lucario

Flying: Staraptor

Poison: Nidoking

Ground: Mamoswine

Fire: Infernape

Bug: Scizor

Ghost: Gengar

Steel: Dialga

Rock: Rhyperior

Water: Empoleon

Grass: Torterra

Electric: Electivire

Ice: Weavile

Dragon:Originally Dialga, but due to the rules, then Salamence

Dark: Umbreon

Psychic: Mewtwo

Normal: Smeargle
Fighting: Hitmontop
Flying: Gliscor
Poison: Crobat
Ground: Swampert
Rock: Shuckle
Bug: Scizor
Ghost: Rotom-H
Steel: Jirachi
Fire: Typhlosion
Water: Kingdra
Grass: Celebi
Electric: Magnezone
Psychic: Latios
Ice: Weavile
Dragon: Salamence
Dark: Tyranitar

And yes, it IS just a coincidence that all 16/17 of them are OU or above.

Normal: Ursaring
Fighting: Blaziken
Flying: Honchkrow
Poison: Arbok
Ground: Sandslash
Rock: Tyranitar
Bug: Scizor
Ghost: Gengar
Steel: Aggron
Fire: Ninetails
Water: Feraligatr
Grass: Smugleaf
Electric: Raikou
Psychic: Alakazam
Ice: Glacieon
Dragon: Kingdra
Dark: Shiftry

'l) m) ZM: ????? Hex FF
?: pPkMnp
Pokémaniac: .4
99||9: 4 4
B: ????? Hex FE
Bird: 'M
Glitch: 3TrainerPoké
GGQRRROO ROCKET: ?????

Glitch types need love, too. Though most of them only have one Pokémon. :V

Are those all of the glitch types?

Also, notice the topic says all 17 types. Please stick to those.

Normal: Snorlax
Fighting: Hitmontop
Flying: Dodrio
Poison: Koffing
Ground: Cradily
Fire: Magmortar
Bug: Heracross
Ghost: Mismagius
Steel: Scizor
Rock: Tyranitar
Water: Tentacruel
Grass: Roserade, but it may become Smugleaf
Electric: Jolteon
Ice: Glaceon
Dragon: Garchomp
Dark: Umbreon
Psychic: Azelf

I nickname ALL of the Pokemon I actually use. Everyone else can die. At the end of my choice, I will list their nicknames, as I do love nicknames for my partners. Here goes.

Normal: Skitty [ADORABLE. :3 MsKittyCat.]
Fighting: Lucario [Currently using one in my team. Lilith]
Flying: Pidgeot [A classic. :D F22Raptor.]
Poison: Toxicroak [An old team-member, pre-Lucario. Pestilence.]
Ground: Donphan [Used to use one back in the days of Silver. Heavyarms [[Yes, as in the Gundam]].]
Fire: Rapidash [I know I use a Blaziken and a Houndoom as my first and secondary Fire primaries, but Rapidash is just so pretty... n.n Nightmare.]
Bug: Vespiquen [By a long shot. Hivemind.]
Ghost: Mismagius [She was practically created for me. I love Ghost-types, and the Witch references sans a bias view of Witches is a total thumbs up. Booga.]
Steel: Aggron [Again, by a long shot. Isuitgon]
Rock: Desukaan [Considering if he ends up being Rock, and not Ground. Depending on it's front features, either Isis [[Female]] or Osiris [[Male]], if it's front is closer to a human mummy sarcophagus, or Ubasti [[Female]] and Anubis [[Male]] if the sarcophagus is closer to a Beastial appearance. I have high expectations of Desukaan.]
Water: Feraligatr [This will never falter. Even with the advent of a Mermaid Pokemon.... Hrm... A Mermaid Pokemon... LET IT BE KNOWN IF A MERMAID POKEMON ARISES IN THE FIFTH GENERATION THAT I CALLED IT FIRST. Anyway, Terrorgatr.]
Grass: Torterra [Hell yes gigantic Ankylosaurus with a mini-mountain range and tree on it's effin' back. Bramblast.]
Electric: Fridge Rotom [Cause it's a freakin' fridge! Mr. Maytag.]
Ice: Froslass [Yuki Onna in Pokemon form. I adore playing games with any Mythological references, but a mythos reference in my favorite game series just rocks. Yuki.]
Dragon: Garchomp [Because sharks rock. I used to use him in my secondary team. Gashthrash. >:3]
Dark: Houndoom [I would have liked to see Houndoom with either more evil written into it's history or sprite, I.E. more heads. Cerberus.]
Psychic: Gardevoir [Very, very close to being my all-time Favorite, above all others. Kaanta.]

All of these I have used in some state or another as a Primary fighter. None were selected based on any one feature. To me, they're all awesome for every reason. n.n]

Normal: Exploud Awesome.
Fighting: Lucario :lucario: I know... way too predictable.
Flying: Togekiss The cutest thing you don't want to meet in a dark alley.
Poison: Crobat Awesome.
Ground: Flygon Awesome
Fire: Arcanine :59: Awesome, loyal, epic.
Bug: Vespiquen Awesome
Ghost: Giratina :giratina: AWESOME
Steel: Metagross Awesome
Rock: Tyranitar aweSOME
Grass: Ludicolo He's cool.
Water: Kingdra awesome
Electric: Electivire awesome
Ice: Frosslass worth of some awe.
Dragon: Rayquaza awesome
Dark: Zoroark cool
Psychic: Mewtwo awesome.