Pokemon that are missing a type

Mega Blastoise: Water/Steel
Arbok: Poison/Dark
Ninetales: Fire/Ghost
Venomoth: Bug/Psychic
Psyduck and Golduck: Water/Psychic
Koffing and Weezing: Poison/Fire
Electabuzz and Electivire: Electric/Fighting
Magmar and Magmortar: Fire/Fighting or Fire/Psychic
Gyarados: Water/Dragon or Water/Dark
The Porygon line: Normal/Electric or Normal/Psychic
Meganium and Serperior: Grass/Dragon
Typhlosion: Fire/Ground
Feraligatr: Water/Dark
Noctowl: Psychic/Flying
Bellossom, Petilil, and Lilligant: Grass/Fairy
Bonsly and Sudowoodo: Rock/Grass
Sunflora: Grass/Fire
Misdreavus and Mismagius: Ghost/Fairy
Dunsparce: Normal/Ground or Normal/Dragon
Granbull: Fairy/Dark
Stantler: Normal/Psychic
Masquerain: Bug/Water
Slaking: Normal/Ground or Normal/Fighting
Volbeat and Illumise: Bug/Electric or Bug/Fairy
Zangoose: Normal/Fighting or Normal/Dark
Seviper: Dark/Poison
Mega Absol: Dark/Fairy
(Mega) Glalie: Ice/Rock or Ice/Dark
Staraptor and Braviary: Fighting/Flying
Luxray: Electric/Dark
Yanmega: Bug/Dragon
Cresselia: Psychic/Fairy
Darkrai: Dark/Ghost
Pignite and Emboar: Fire/Dark or Fire/Ground
Dewott and Samurott: Water/Fighting
Audino: Normal/Fairy
Cofagrigus: Ghost/Steel
The Gothita line: Psychic/Dark
Elgyem and Beheeyem: Psychic/Electric
Beartic: Ice/Fighting
Cryogonal: Ice/Steel
Accelgor: Bug/Dark
Druddigon: Dragon/Rock
The Flabébé line and Xerneas: Fairy/Grass
Aromatisse: Fairy/Poison
Heliolisk: Electric/Dragon
The Goomy line: Dragon/Poison

I know you mentioned it, but Psyduck was the first one that came to my head. Crazy how its just Water.

Gyarados should really be Water/Dark or Water/Dragon. The typing of its Mega form makes much more sense than its regular form... But doesn't its Mega evo fly in the games? :o

Golduck should be Water/Psychic, but I can definitely live with Psyduck being pure Water. It's the final evo that counts.

Speaking of that, I was disappointed the first times I tried playing Ruby when I noticed that Grovyle didn't gain a second typing like Marshtomp and Combusken did. Not even Sceptile become dual typed. That was so boring, and the reason I never used the grass starter properly in those games :p

I always thought haxorus could do with a secondary type, maybe bug or steel.

LightningAlex said:

I was always very surprised that Groudon wasn't a Fire-type. I mean, he uses Fire attacks, he can dry out large bodies of water, and he was chased by Team >>Magma<<. Sure, his primal form will have the Fire-type added to it, but it's just weird that its original form is just Ground.

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Magma/lava and fire are two entirely different things, and giving groudon fire type when it was introduced would've made it even weaker to Kyogre, though I am glad his primal form has it.

Honestly, I thought the entire Flabébé line at first was part-grass type. It's a flower, so that's what threw that assumption at me.

Too many come to mind to name, but I think the worst offender is Groundon. He's just a Ground-type as opposed to duel Ground and Fire! There's a fair few who are either only Psychic or Dark but I feel like should be both.

Gabite and Garchomp: Ground and Fighting seem better suited to them than Ground and Dragon .. *gasp*
Elekid, Electabuzz, Electivire: Electric and Fighting, I mean, really?
Masquerain: Keep the Bug and Water of Surskit, please?
Gyarados: Shouldn't be Flying type, it doesn't fly, why not keep it a plain Water type? Water and Dark for the Mega is acceptable, though.
Chikorita, Bayleef, Meganium: Grass and Ground, though I'm not so sure about that.
Cottonee, Whimsicott, Azurill, Marill, Azumarill, Dedenne: Why are they Fairy type?
Gligar, Gliscor: Ground and Poison, they're gliders, not fliers! And Poison type is totally fitting for scorpions, right?
Emolga: Electric and not Flying, by similar reasoning
Tornadus, Thundurus, Landorus: Incarnate forms do not look like Flying types! Isn't a simple Levitate enough?
Cresselia: Adding the Fairy type would help it greatly, and cancel the disadvantage against Darkrai!
Darkrai: Dark and Ghost seems sensible, right?
Shaymin: Land form isn't Ground type? Whoops...
Victini: Seems more like a Fairy type than Psychic..
Xerneas: Grass type could level its advantage over Yveltal
Glalie: This is a Rock, isn't it?

Most of the ones have been said already, but primarily Audino and Chansey/Blissey, which I think should be Fairy due to their status as being healers. At least M-Audino is Fairy type, though.

I always forget that Psyduck and Golduck aren't part psychic. I guess the anime is partly to blame, and the translated names. (In French, it is Psykokwak :p)