This is my ubers team for X and Y and so far its doing great. I feel it needs improvements tho which is why I posted here. So without further ado, let's dive in.
Yveltal @ Life Orb
Ability: Dark Aura
EVs: 252 SAtk / 224 Spd / 32 Atk
Hasty Nature
- Dark Pulse
- Sucker Punch
- Roost
- Oblivion Wing
This is who I based my whole team around and good god is it quite the offensive force. No one is safe from its dark pulse, save for tyranitar, areceus dark, and arceus fighting. Dark pulse and oblivion wing are the STAB moves of choice, I ran sucker punch because he needs the priority and also, yveltal's sucker punch is the most powerful priority move in the game, factoring in STAB and Dark Aura, and roost to restore life orb recoil. I ran 252 EVs in special attack to hit as hard as possible with its STAB moves. 224 speed is to outspeed unboosted max speed kyurem-w and rayquaza. The rest is dumped into attack to hit as hard as possible with sucker punch.
Aegislash @ Leftovers
Ability: Stance Change
EVs: 252 HP / 88 SDef / 168 Atk
Sassy Nature
IVs: 0 Spd
- King's Shield
- Toxic
- Gyro Ball
- Shadow Sneak
Aegislash is my second choice for my team. He resists most of Yveltal's weakneses and Yveltal resists most of Aegislash's weaknesses. The EV spread allows him to take geomancy-boosted hidden power fires from xerneas like a champ and ko back with a combination of gyro ball and shadow sneak, making him the perfect xerneas counter. the reason I run toxic is because he doesn't grab many opportunities to set up swords dance and this is the only way he can defeat lugia.
Palkia @ Choice Scarf
Ability: Pressure
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Thunder
- Surf
- Spacial Rend
- Fire Blast
I chose this guy because I needed a reliable switch-in to kyogre as well as a scarf user. He also provides a 4x resistance to fire. The movesets and EVs are pretty straightforward, allowing Palkia to hit as hard and fast as possible with maximum coverage and also provides one of the best STABs in the game, dragon.
Forretress @ Leftovers
Ability: Sturdy
EVs: 252 Def / 252 HP / 4 SDef
Bold Nature
- Rapid Spin
- Stealth Rock
- Toxic Spikes
- Pain Split
I realized I had no entry hazards or rapid spin support so I bundled it into one. I put stealth rocks because like all ubers teams, this one struggles against ho-oh. I also carry toxic spikes because it saves me the trouble of poisoning the other team. I ran pain split so that i could have an easier time with e-killer arceus and ferrothorn.
Landorus-Therian (M) @ Choice Band
Ability: Intimidate
EVs: 252 Atk / 224 HP / 32 Def
Adamant Nature
- U-turn
- Stone Edge
- Superpower
- Earthquake
The reason that I chose this guy was that I needed a check to e-killer arceus and provide an electric immunity. Its earthquake is insanely powerful coming off of its high base 145 attack. The fact that it gets u-turn makes it a good pivot and great for scouting.
Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 148 SDef / 108 Spd
Calm Nature
- Lava Plume
- Taunt
- Toxic
- Roar
My final member of my team serves as my counter to stall. The EV spread allows it to outspeed uninvested base 90's while taking special hits. Lava plume is to spread burns, Toxic is to spread poison, taunt is to dismantle stallers, and roar is for phazing purposes. Its great typing also makes it a good ho-oh check.
So that's my team. I hope you guys have some good advice for my team! :D