Competitive team?

[Munkeytoto]

Okay, Here is my Planned team. Now I don't mind making Changes, BUT!, I do Love my Gengar, Garchomp and Bronzong and they are 3/4 Of the way EV trained...
Other than that, please give me plenty feedback on what you think i should change to my team. I'm Utterly new here and would love some of your opinions!

The Team;​

Lead;
Yanmega @ Focus sash.
Modest Nature - EV's(104 Def / 252 SpA / 152 Speed) - Speed boost
- Protect
- Air Slash
- Bug Buzz
- HP fire*
* - Have NO idea how to do IV training/Breeding.
Okay, So basically after a turn of protect, it will get a free speed boost then will hopefully move first and get something powerful in and 1HKO Their lead.

Rapid Spinner;
Donphan @ Leftovers
Impish Nature - EV's(252 HP/ 86 Atk / 172 Def) - Sturdy
- Earthquake
- Rock Slide
- Rapid spin
- Rest
Donphan is for Spinning away stealth rocks that would mess Yanmega up, Support Pokemon

Wall;
Bronzong @ Leftovers
Relaxed Nature - EV's(252 HP / 204 S.Def / 52 Atk) - Levitate
- Gyro Ball
- Hypnosis
- Stealth Rock
- Explosion
Basically a wall/ support. Could set up Stealth Rock mid-game and sleep a powerful sweeper or suicide with explosion.

Mixed Sweep;
Lucario @ Expert belt
Jolly Nature - EV's(252 Atk / 252 Spe / 4HP) - Steadfast
- Substitute
- Close Combat
- Crunch
- Extremespeed
He's my mixed sweeper and helps to give me good Type coverage. He works in synch with the other sweepers to tear holes into the enemy team.

Special Sweeper;
Gengar @ Petaya Berry
Modest Nature - EV's(252 S.Atk / 252 Spe. / 6 HP) - Levitate
- Shadow Ball
- Sludge Bomb
- Focus Blast
- Substitute
Not much explaining here really, Gengar is a BEASTLY pokemon and I intend to use him to kill as much as possible!

Physical Sweeper;
Garchomp @ Life orb
Jolly Nature - EV's(200 Att / 252 Spe. / 52 HP) - Sand Veil
- Substitute
- Swords Dance
- Earthquake
- Draco Meteor (Dragon claw?)
I think he might not need sub or Swords dance but i think if i can get a turn or two to boost attack and raise a sub, he could sweep a chunk of the enemy team's team out :)

That was quite a large post but i want you to know as much as possible so you can help fine tune my team, I'm new here so if one of these has a gaping weakness/ Flaw then tell me straight up! Feedback is appreciated! :)

 

[Aurafire]

Unfortunately, Garchomp is banned from standard play in fourth generation play, so you'll have to use Dragonite or Flygon. Here is a tier list for reference: https://www.smogon.com/dp/pokemon/

 

[PlatinumDude]

I wouldn't call Lucario a mixed sweeper because it only has physical moves. Swords Dance is a better option over Substitute.