Legendary Pokémon

I have to disagree, there is no point in running max speed unless you're using Sand Power, a suicidal Sand Power + Swords Dance set can work, but that's far too dangerous with Doryuzuu's average-ish speed.

I suggest using this Doryuzuu:

Doryuzuu @ Life Orb
Adamant
252 Atk / 136 HP / 164 Spe
Sand Throw
- Swords Dance
- Rock Slide (Shame it can't learn Stone Edge)
- Earthquake
- Shadow Claw or Return

Doryuzuu can't go beyond this moveset, the EVs are set to outspeed Scarf Flygon, Jirachi and Shandera in Sandstorm so they can't revenge-kill it, max attack is necessary to hit as hard as possible, rest is dumped into HP for a nice additional amount of bulk.

And as for mixed defenses, i hope you're not referring to the old (sorry to say this) and noob EV spread of 252 Def / 252 SpD / 4 HP

The best Nattorei set i can see right now is (non-support/lead set) this:

Nattorei @ Rugged Helmet
252 HP / 4 Atk / 252 SpD
Sassy (+SpD, -Spe)
0 Spe IVs
- Curse
- Gyro Ball
- Leech Seed / Ingrain
- Rest

This set however falls to opposing Nattorei. This is supposed to use Curse to be invincible and then sweeping with Gyro Ball while doing damage with Rugged Helmet and it's awesome ability, Rest while needed, and even while you're resting, you're STILL doing damage if you have Leech Seed in play and even if you don't, it'll do a lot of damage with Rugged Helmet and Steel Thorns anyway. Ingrain can be used so you can't be phazed.

About Doryuuzu,the problem is that if you get outruned by other Doryuuzus (which are supposed to be the No.1 threat right now),you're dead.

About Nattorei,I am referring to 252 HP / 60 Def / 196 SDef or 252 HP / 132 Def / 124 SDef (the 2 EV spreads I've seen on Smogon's analysis). Actually the Nattorei I run is supposed to act as a lead.

I've never liked mixed defensive spreads, it's either a physical tank or a special one. Unless the EV spread is supposed to make the Pokemon survive certain hits from certain Pokemon.

And the movesets are posted on smogon already ? Damn.

Anyway, i thinking the best moveset for a lead Nattorei that i can think of is this:

Nattorei @ Rugged Helmet (cancels Focus Sash)
252 HP / 252 Atk / 4 Def (or 252 HP / 252 Def / 4 SpD)
Brave
- Power Whip
- Spikes / Stealth Rock
- Explosion
- Gyro Ball

And i wouldn't keep my own Doryuzuu on opposing Doryuzuu anyway, so i personally won't run max speed, 164 speed is more than enough.

BTW, after taking another look at the team, Grass-Pokemon can be a huge threat, Nattorei with Power Whip or Seed Bomb can do lots of damage, i suggest having another Fire attack in your team or just remove Swampert for a something else.

Hope i didn't sound rude..

It's okay you didn't. What should I replace Swampy with? I don't want something weak to Stealth Rock. If Garchomp ends up OU,he'll replace Swampy instantly. Garchomp's coverage combined with Sand Veil is too good to pass. If it doesn't,do you have any good suggestions?

Skarmory comes to mind.

But then you'll be weak to Fire.

I've also thought of Scarmory,but I don't like the Fire weakness. As I said in the OP,the team's main weaknesses are Grass,Water and Fight. Water gets covered by Nattorei and Gengar's Thunderbolt,Fight is absorbed by Gengar,and Hippowdon's Ice Fang and Tyranitar's Fire Fang are "answers" to Grass pokemon but I still think they could be a problem. Ironicly,Tyranitar is weak to all 3 but I don't think I could take it out. If a Drought Ninetales/Drizzle Politoed comes out after Hippowdon dies,Tyranitar would be useful for putting a Sandstorm again.

Also:
*There's a chance I won't breed for HP Fire/Ice for Gengar. Could you suggest another move instead?
*If I keep Swampert,what should I use as a 4th move?

Roar.

Or give Roar to Hippo and give Swampert SR.

BTW, on Doryuzuu, use Return > Metal Claw, you already hit what Metal Claw hits for super-effective damage, and Return has more power. (Metal Claw has 75 base power if you include STAB, Return has max 102.)

Bumping this up for great justice. I'm replacing Swampert for Garchomp. Garchomp is already awesome,Sand Veil is just the icing on the cake. I can also troll the Battle Subway with Sand Veil + Brightpowder (yes I will fight hax with hax!)