Hello, I am new here at Smogon and Pokemon Showdown, so I've decided to post my new NU team. Although it's given me good results I think there's something missing and I wouls really appreciate if you could help me finding and improving it.
By the way, forgive my poor English, I am Spanish xD
Here's the team:
Cazalla (Mawile)@leftovers
Ability:Intimidate
EVs: 252 HP, 252 Def, 4 SpD (Impish nature)
Moves:
Pain Split
Seismic Toss
Stealth Rock
Foul Play
This is my lead, she can lay SR and take physical hits, do some damage to walls whith seismic toss and surpise some physical sweepers like Golurk. At first she had taunt instead of foul play, but she was way too slow to avoid SR from happening, so that's why I changed it. With pain split she recovers HP and hurts walls like alomomola.
Vodka (Drifblim)@flying gem
Ability:Unburden
EVs: 252 Atk, 252 Spe, 4 HP (Adamant nature)
Moves:
Acrobatics
Substitute
Disable
Destiny Bond
This little fellow can surpise unprepared teams. Once I've used acrobatics, which power increases thanks to the gem, unburden activates and Drifblim outspeeds almost everything. Then, acrobatics base power is over 100 and combined with substitute and disable it can survive and sweep entire teams. When all four subs have been used, Destiny Bond is a good way to say bye.
Brandy (Liepard)@leftovers
Ability: Prankster
EVs: 80 HP, 8 Def, 252 SpD, 168 Spe (Timid nature)
Moves:
Substitute
Foul Play
Thunder Wave
Swagger
This set is pretty normal, but it works perfectly. Thanks to its ability, substitute, thunder wave and swagger are priority moves and with foul play it can neutralize great dangers such as Golurk, Gudurr and company. Plus, this Pokemon's design is way too cool. It's a freaking cat.
Whisky (Exeggutor)@lum berry
Ability: Harvest
EVs: 128 HP, 252 SpA, 128 Spe (Timid nature)
Moves:
Giga Drain
Psychic
Hidden Power Ice
Rest
Exeggutor is my team's special attacker. Thanks to its ability and item it doesn't have to worry about status changes and it can use rest without any fear. Giga Drain is a good STAB move and it reduces the need of rest, Psychic is also there for Stab and Hidden Power Ice gives it some coverage. The timid nature is so that it can outspeed some threats.
Ron (Relicanth)@choice scarf
Ability: Rock Head
Evs: 4 HP, 252 Atk, 252 Spe (Adamant nature)
Moves:
Double-Edge
Head Smash
Earthquake
Waterfall
This often ignored Pokemon is just an awesome sweeper. Since it isn't very used, most teams just don't know what to expect from it and that's really useful. Thanks to the scarf, it outspeeds many Pokes, and with its ability and grat attack it can do a great damage without fearing the recoil. Moreover, its naturaly high physical defense allows it to take many hits.
Tequila (Muk)@leftovers
Ability: Poison Touch
EVs: 252 HP, 4 Def, 252 SpD (Careful nature)
Moves:
Curse
Shadow sneak
Substitute
Poison Jab
Muk's my special wall, though it's not giving the results I expected. Usually, I try to set a substitute and try becoming bulkier with curse. Once there, I can hit with poison jab if I know I can take a hit or with shadow sneak if i need to quickly finish an enemy.
So this is my team, I hope you guys can help me finding what's wrong and enjoy reading my post.
Again, frogive my bad English >.<
By the way, forgive my poor English, I am Spanish xD
Here's the team:

Cazalla (Mawile)@leftovers
Ability:Intimidate
EVs: 252 HP, 252 Def, 4 SpD (Impish nature)
Moves:
Pain Split
Seismic Toss
Stealth Rock
Foul Play
This is my lead, she can lay SR and take physical hits, do some damage to walls whith seismic toss and surpise some physical sweepers like Golurk. At first she had taunt instead of foul play, but she was way too slow to avoid SR from happening, so that's why I changed it. With pain split she recovers HP and hurts walls like alomomola.
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Vodka (Drifblim)@flying gem
Ability:Unburden
EVs: 252 Atk, 252 Spe, 4 HP (Adamant nature)
Moves:
Acrobatics
Substitute
Disable
Destiny Bond
This little fellow can surpise unprepared teams. Once I've used acrobatics, which power increases thanks to the gem, unburden activates and Drifblim outspeeds almost everything. Then, acrobatics base power is over 100 and combined with substitute and disable it can survive and sweep entire teams. When all four subs have been used, Destiny Bond is a good way to say bye.

Brandy (Liepard)@leftovers
Ability: Prankster
EVs: 80 HP, 8 Def, 252 SpD, 168 Spe (Timid nature)
Moves:
Substitute
Foul Play
Thunder Wave
Swagger
This set is pretty normal, but it works perfectly. Thanks to its ability, substitute, thunder wave and swagger are priority moves and with foul play it can neutralize great dangers such as Golurk, Gudurr and company. Plus, this Pokemon's design is way too cool. It's a freaking cat.

Whisky (Exeggutor)@lum berry
Ability: Harvest
EVs: 128 HP, 252 SpA, 128 Spe (Timid nature)
Moves:
Giga Drain
Psychic
Hidden Power Ice
Rest
Exeggutor is my team's special attacker. Thanks to its ability and item it doesn't have to worry about status changes and it can use rest without any fear. Giga Drain is a good STAB move and it reduces the need of rest, Psychic is also there for Stab and Hidden Power Ice gives it some coverage. The timid nature is so that it can outspeed some threats.

Ron (Relicanth)@choice scarf
Ability: Rock Head
Evs: 4 HP, 252 Atk, 252 Spe (Adamant nature)
Moves:
Double-Edge
Head Smash
Earthquake
Waterfall
This often ignored Pokemon is just an awesome sweeper. Since it isn't very used, most teams just don't know what to expect from it and that's really useful. Thanks to the scarf, it outspeeds many Pokes, and with its ability and grat attack it can do a great damage without fearing the recoil. Moreover, its naturaly high physical defense allows it to take many hits.

Tequila (Muk)@leftovers
Ability: Poison Touch
EVs: 252 HP, 4 Def, 252 SpD (Careful nature)
Moves:
Curse
Shadow sneak
Substitute
Poison Jab
Muk's my special wall, though it's not giving the results I expected. Usually, I try to set a substitute and try becoming bulkier with curse. Once there, I can hit with poison jab if I know I can take a hit or with shadow sneak if i need to quickly finish an enemy.
So this is my team, I hope you guys can help me finding what's wrong and enjoy reading my post.
Again, frogive my bad English >.<