But that doesn't make it outright impossible. Anubite's original statement implied he thought there weren't even 6 dragons allowed in standard.
Sorry, I didn't intend to imply this. I know there are 6 pokemon - however, almost all of them are 4x to ice. It's a pretty bad team to monoteam with, even with their decent move pools and high stats.
And using NFEs? I've tried that with dragon, trust me, doesn't work (Gabite isn't that good, neither is dragonair or shelgon). The only NFE I've actually used in OU to any degree of success is Slakoth...
Rock mono teams aren't terrible, I've done rather well in UU. But you basically need sandstream to do well with them. Also, Probopass makes an amazing defensive SpA - has access to some nice moves. Just watch out for EQ and fighting. Lunatone is incredible too, has access to cosmic power, calm mind, I think barrier, and a tons of great SpA moves for covering rock's weaknesses. Only problem is it's terrible speed. It's like it's a "I wish I was cresselia" pokemon.
And of course the sub-type matters, I didn't want to imply that by picking water, it's suddenly a better type. I was rating the types more on their accessibility and flexibility.
Flying types are pretty bad at mono-typing, even though they cover a lot of kinds of pokemon, they are weak to SR and are on a whole, frail. Many have 4x weaknesses, too. Their stats aren't usually stellar either (around the 450-500 range, I think, though poison is there was well and I give undue praise to them for their awesomeness).
I wasn't trying to create any paradigm statements about monoteams, I just wanted to bring the topic to light as it seemed that no one talked about them, and when they're posted in RMT, people usually go "LOL WHERE'S YOUR WILDCARD DUDE HEATRAN'S JUST GONNA SWEEP THIS???" and the person is automatically labelled as a noob, or something. That's my impression, anyway.
Oh and I did forget fighting on my list, that's not because I </3 fighting, but because I haven't really mono-teamed with it. I think I did only once, and didn't like my team that much. Been staying away from it, I guess.
As for wildcards, I said I don't use them, I feel it does tarnish the spirit of a monoteam, but I can understand if people want to use them. I usually accept teams of 5 + wildcard as a monoteam...