I'm aware of EVs/IVs but I never really went for great strategies, just I built my own, and they usually fail. My friend recommended Smogon and now I'm working on my first Smogon Recommended team, using nothing but pokemon with the recommended sets by Smogon. Here's what I got, and please rate this and leave feedback.
Skarmory w/ Leftovers
Ability: Sturdy
EVs: 252 HP/ 4 Def/ 252 SDef
Impish Nature
-Spikes
-Roost
-Whirlwind
-Toxic
I lead with Skarmory by setting up Spikes to cripple anything that isn't flying, ghost, or a Levitator that my opponent has as well as acting as a wall. It's natural great Defense plus EV trained HP and Sp. Def makes Skarmory a tough opponent to KO, with Sturdy to at least guarantee me one Spikes. For those walls such as Snorlax, it can use Toxic to cripple it and Roost to take care of the damage that has been done. If I need to get rid of the opponent fast, it can use Whirlwind, switching them out and activating Spikes. Leftovers are there just to keep Skarmory alive even longer.
Absol w/ Life Orb
Ability: Super Luck
EVs: 4 HP/ 252 Atk/ 252 Spe
Naughty Nature
-Sucker Punch
-Night Slash
-Flamethrower
-Superpower
As my All-Out Attacker, Absol is made to do nothing but deal damage. With the Attack and Speed EV training, it can become a sweeper. The Life Orb withers it's health, however in exchange for more attack power. Sucker Punch will do quick and easy damage before the foe attacks, which is useful for when they're low on health and decide to attack one last time, along with STAB. Night Slash is great with it's base 70 attack power, and it's deadly with STAB. Night Slash also has a high critical hit ratio, which is complemented by Absol's Super Luck. Flamethrower helps with dangerous pokemon such as Scizor and Heracross. Superpower is used as a pure power last resort which can ultimately destroy Hydreigon and Weavile.
Gengar w/ Black Sludge
Ability: Levitate
EVs: 4 HP/ 252 SAtk/ 252 Spe
Timid Nature
-Substitute
-Disable
-Shadow Ball
-Focus Blast
This Gengar specializes in a Substitute/Disable set. It's EVs give it more power and enough speed to do whatever it pleases. Levitate is it's only ability, and it's great because it eliminates it's ground weakness. Black Sludge heals Gengar and really hurts those usual Trick users. Substitute and Disable work together as Gengar can disable an opponent's vital move, then substitutes and destroys the opponent with a STAB Shadow Ball or a Focus Blast. This set becomes good agaisnt Dragon Dance users, especially Dragon Dance Scrafty.
Mienshao w/ Life Orb
Ability: Regenerator
EVs: 252 Atk/ 4 SAtk/ 252 Spe
Jolly Nature
-Swords Dance
-Baton Pass
-Hi Jump Kick
-Stone Edge
Mienshao is the key to making all the physical attackers in my team what they should be. It's main use is to survive a turn to set up a Swords Dance, then Baton Pass to a pokemon such as Absol. If i'm confident, or if Mean Look is in play, Mienshao's Attack/Speed EVs should help me destory the opponent with the brute force of Life Orb+ STAB Hi Jump Kick. Stone Edge is useful for the flying types such as Ho-Oh and Charizard. Regenerator complements Baton Pass very well, healing Mienshao everytime it uses it, making it very reusable in battle. It's speed can outspeed Dragon Dance Scraftys and can OHKO pokemon such as Weavile and Hydreigon.
Cloyster w/ White Herb
Ability: Skill Link
EVs: 4 HP/ 252 Atk/ 252 Spe
Jolly Nature
-Shell Smash
-Icicle Spear
-Rock Blast
-Surf
Cloyster is a combo master in this set. Shell Smash lowers it defenses, but raises it's attacks and speed, however the White Herb comes in to let me retain my defenses, ending up with a Speed, Attack, and Sp. Atk boost. Skill Link ensures that it's STAB Icicle Spear and Rock Blast hit each 5 times, with Shell Smash giving each hit more buff. Rock Blast helps agaist Archeops and Aerodactyl. Surf acts as another STAB move that could take out the opponent's rock and fire types, such as Rhyperior and Infernape.
Gliscor w/ Toxic Orb
Ability: Poison Heal
EVs: 252 HP/ 40 Def/ 216 Spe
Jolly Nature
-Substitute
-Protect
-Toxic
-Earthquake
Gliscor is somewhat a physical attacker, but it's mostly a Substitute/Protect/Toxic staller. Gliscor can use it's HP and Defense to stay alive, while the Toxic Orb/Poison Heal combo heals me as well as give me immunity from Paralysis and Sleep. While the foe is poisoned, Giscor can use Earthquake to finish them off, which works well when Gliscor outspeeds Ice Punch Electivire.
Skarmory w/ Leftovers
Ability: Sturdy
EVs: 252 HP/ 4 Def/ 252 SDef
Impish Nature
-Spikes
-Roost
-Whirlwind
-Toxic
Absol w/ Life Orb
Ability: Super Luck
EVs: 4 HP/ 252 Atk/ 252 Spe
Naughty Nature
-Sucker Punch
-Night Slash
-Flamethrower
-Superpower
Gengar w/ Black Sludge
Ability: Levitate
EVs: 4 HP/ 252 SAtk/ 252 Spe
Timid Nature
-Substitute
-Disable
-Shadow Ball
-Focus Blast
Mienshao w/ Life Orb
Ability: Regenerator
EVs: 252 Atk/ 4 SAtk/ 252 Spe
Jolly Nature
-Swords Dance
-Baton Pass
-Hi Jump Kick
-Stone Edge
Cloyster w/ White Herb
Ability: Skill Link
EVs: 4 HP/ 252 Atk/ 252 Spe
Jolly Nature
-Shell Smash
-Icicle Spear
-Rock Blast
-Surf
Gliscor w/ Toxic Orb
Ability: Poison Heal
EVs: 252 HP/ 40 Def/ 216 Spe
Jolly Nature
-Substitute
-Protect
-Toxic
-Earthquake
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