EDIT: Thanks to Blazin Kicking Chicken I've made changes and they've worked out great. Thank Blazin!
This is my final 4th gen team. It's purpose is to set up sandstorm, spikes, toxic spikes, and stealth rock and cause a lot of switches to wear down the opponent's pokemon in order for Lucario to sweep at the end.
Lead:
Hippodown @ Leftovers
Impish
252 HP / 152 Def / 104 SpD
~ Earthquake
~ Slack Off
~ Stealth Rock
~ Roar
I used to have Swampert for Stealth Rocks and Forrestress as my lead. While playing it kinda hit me...Hippowdown is a lot more bulky than Swampert and can still lay down Stealth Rock AND get sandstorm going. He has the same set as my Swampert did but Slack off instead of Ice Beam (I never even got the chance to use Icebeam anyways). Sandstorm negates leftovers for my opponent and helps wear them down even more to help with Lucario's sweep. I guess this is a sandstorm team in the end after the changes.
Special Defense Wall:
Forrestress @ Leftovers
Careful
252 HP / 4 Def / 252 SpD
~ Spikes
~ Payback
~ Rapid Spin
~ Toxic Spikes
This is my lead, and yes you saw that correctly, my special defensive wall and my counter to ghosts and psychics(w/ out HP fire). He has sooo many resistances and he works great w/ Swampert with a 4x resistence to grass. Spikes, Toxic Spikes, and Rapid Spin are obvious. The special defense ev's allow him to surive Magnezone's HP Fire most of the time, allowing me to get 1 more layer up before I die. Payback is for ghosts. My lead used to be Machamp but this guy is going much better. With the ev's, he can even survive a HP Fire from Roserade.
Spin-blocker:
Rotom-C @ Leftovers
Bold
252 HP / 168 Def / 88 Spe
~ Thunderbolt
~ Shadow Ball
~ Will-O-Wisp
~ Leaf Storm
The good 'ol lawn mower. The ev's are to help him defensively and to outspeed Tyrannitar and burn him or reeaally damage him w/ Leaf Storm...whichever I'm in the mood for. He's such a great counter to all the rapid spinners out there minus Forrestress. He destroys Swampert, Donphan, and Starmie. It's fun watching a Swampert switch out to a Scizor expecting Leaf Storm, and instead gets a Will-O-Wisp.
Special Attacker:
Heatran @ Choice Scarf
Naive
252 SpA / 4 SpD / 252 Spe
~ Flamethrower
~ Earth Power
~ Explosion
~ Hidden Power Electric
This is my main special attacker, Scizor/Steel counter, and secondary Gengar counter. He's good to switch in if I predict a scarfer using trick. He takes fire attacks aimed at Forrestress, Celebi, and Lucario with ease. HP Electric is for Gyarados and weakened Waters. Explosion is to go out with a bang against Blissey if I've scouted and predict a switch.
Physical Wall and Breloom Counter:
Celebi @ Leftovers
Bold
240 HP / 252 Def / 16 Spe
~ Grass Knot
~ Leech Seed
~ Hidden Power Fire
~ Recover
Even though Celebi has 7 weaknesses, she's done great. Celebi is my main Breloom counter. Along with Heatran they make a GREAT defensive core. Grass Knot is for stab to hit Swampert, Tyrannitar, and waters. HP Fire is for steels(Scizor, Metagross, and Jirachi) and other grass pokemon. With the ev's, Pursuit hardly does anything from Scizor. Leech Seed and recover are to stay alive.
Physical Attacker and late game sweeper:
Lucario @ Life Orb
Jolly
252 Atk / 4 Def / 252 Spe
~ Swords Dance
~ Close Combat
~ ExtremeSpeed
~ Crunch
The best Blissey counter in the game imo. SD on the switch and sweep away...pretty simple. Crunch is for Rotom and other ghosts who come in(although Gengar is faster so that's a problem). Close Combat is for raw power. Extremespeed is to finish off weakened foes and is good for faster pokemon like Starmie, Joleton, and Infernape. All of the entry hazards that this team sets up are wonderful for Lucario, even allowing him to OHKO Skarmory w/ a SD boosted Close Combat.
This is my final 4th gen team. It's purpose is to set up sandstorm, spikes, toxic spikes, and stealth rock and cause a lot of switches to wear down the opponent's pokemon in order for Lucario to sweep at the end.
Lead:
Hippodown @ Leftovers
Impish
252 HP / 152 Def / 104 SpD
~ Earthquake
~ Slack Off
~ Stealth Rock
~ Roar
I used to have Swampert for Stealth Rocks and Forrestress as my lead. While playing it kinda hit me...Hippowdown is a lot more bulky than Swampert and can still lay down Stealth Rock AND get sandstorm going. He has the same set as my Swampert did but Slack off instead of Ice Beam (I never even got the chance to use Icebeam anyways). Sandstorm negates leftovers for my opponent and helps wear them down even more to help with Lucario's sweep. I guess this is a sandstorm team in the end after the changes.
Special Defense Wall:

Forrestress @ Leftovers
Careful
252 HP / 4 Def / 252 SpD
~ Spikes
~ Payback
~ Rapid Spin
~ Toxic Spikes
This is my lead, and yes you saw that correctly, my special defensive wall and my counter to ghosts and psychics(w/ out HP fire). He has sooo many resistances and he works great w/ Swampert with a 4x resistence to grass. Spikes, Toxic Spikes, and Rapid Spin are obvious. The special defense ev's allow him to surive Magnezone's HP Fire most of the time, allowing me to get 1 more layer up before I die. Payback is for ghosts. My lead used to be Machamp but this guy is going much better. With the ev's, he can even survive a HP Fire from Roserade.
Spin-blocker:

Rotom-C @ Leftovers
Bold
252 HP / 168 Def / 88 Spe
~ Thunderbolt
~ Shadow Ball
~ Will-O-Wisp
~ Leaf Storm
The good 'ol lawn mower. The ev's are to help him defensively and to outspeed Tyrannitar and burn him or reeaally damage him w/ Leaf Storm...whichever I'm in the mood for. He's such a great counter to all the rapid spinners out there minus Forrestress. He destroys Swampert, Donphan, and Starmie. It's fun watching a Swampert switch out to a Scizor expecting Leaf Storm, and instead gets a Will-O-Wisp.
Special Attacker:

Heatran @ Choice Scarf
Naive
252 SpA / 4 SpD / 252 Spe
~ Flamethrower
~ Earth Power
~ Explosion
~ Hidden Power Electric
This is my main special attacker, Scizor/Steel counter, and secondary Gengar counter. He's good to switch in if I predict a scarfer using trick. He takes fire attacks aimed at Forrestress, Celebi, and Lucario with ease. HP Electric is for Gyarados and weakened Waters. Explosion is to go out with a bang against Blissey if I've scouted and predict a switch.
Physical Wall and Breloom Counter:

Celebi @ Leftovers
Bold
240 HP / 252 Def / 16 Spe
~ Grass Knot
~ Leech Seed
~ Hidden Power Fire
~ Recover
Even though Celebi has 7 weaknesses, she's done great. Celebi is my main Breloom counter. Along with Heatran they make a GREAT defensive core. Grass Knot is for stab to hit Swampert, Tyrannitar, and waters. HP Fire is for steels(Scizor, Metagross, and Jirachi) and other grass pokemon. With the ev's, Pursuit hardly does anything from Scizor. Leech Seed and recover are to stay alive.
Physical Attacker and late game sweeper:

Lucario @ Life Orb
Jolly
252 Atk / 4 Def / 252 Spe
~ Swords Dance
~ Close Combat
~ ExtremeSpeed
~ Crunch
The best Blissey counter in the game imo. SD on the switch and sweep away...pretty simple. Crunch is for Rotom and other ghosts who come in(although Gengar is faster so that's a problem). Close Combat is for raw power. Extremespeed is to finish off weakened foes and is good for faster pokemon like Starmie, Joleton, and Infernape. All of the entry hazards that this team sets up are wonderful for Lucario, even allowing him to OHKO Skarmory w/ a SD boosted Close Combat.