AUGH!!!! I accidentally closed this window when I was over halfway done and lost everything I was typing. >.< Therefore, a lot of what you read is my attempt at rewriting what I had, but with less enthusiasm. :(
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This team is currently Rank 10 - Steak 42 on WiFi battles, but only managed 52 on single battles thanks to a double grass team. :( But more on that later. For now, the proud-to-be champions:
Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP/252 Def/4 SpD
Nature: Impish
Waterfall
Avalanche
Earthquake
Protect
Swampert is, in my opinion, one of the best leads for WiFi battles! He walls three of the most commonly used pokemon (Metagross, Garchomp, and Tyranitar) with ease, along with many others!
Avalanche is a guaranteed OHKO on all three of the popular dragon types (Dragonite, Garchomp, Salamence) unless they are holding a Yache Berry or they used Dragon Dance/Sword's Dance instead of attacking (bloody Garchomps!!!) However, Swampert is bulky enough to take even a Sword's Danced Outrage from a Garchomp.
Protect is extremely useful (and necessary) for scouting for grass moves from common leads such as Infernape and Latios/Latias. Plus, it allows Swampert to maximize his HP gain against anything he can't straight up OHKO. It also walls Slaking perfectly, which seems to be a popular pokemon in WiFi battles for some reason.
Gengar @ Focus Sash
Ability: Levitate
EVs: 252 SpA/252 Spe/4 HP
Nature: Timid
Shadow Ball
Thunderbolt
Sucker Punch
Destiny Bond
Sucker Punch? Are you crazy!? - It is there for one reason and one reason only: Opposing Gengar. Due to the retarded WiFi rules about a tie being equal to a loss, an opposing Gengar won't hesitate to Destiny Bond even if we're both down to our last pokemon, therefore resulting in a loss and ending my streak. Sucker Punch deals quite well with any opposing Focus Sashed Gengar (or even ones with less-than-half HP) without having to roll the dice on a speed tie. Until I started using it, Gengar was the biggest threat to this team.
Aside from that, Gengar is a great sweeper and extremely useful for taking out big threats thanks to Destiny Bond and the A.I.'s inability to prevent itself from attacking into it. :)
Lucario @ Life Orb
Ability: Steadfast
EVs: 252 Atk/252 Spe/4 HP
Nature: Adamant
Close Combat
Crunch
Extreme Speed
Sword's Dance
Due to Lucario's weaknesses and general frailness, he isn't the ideal choice for switching in against most common pokemon in WiFi battles. However, that is not his job. His role is pivotal in that whatever Swampert or Gengar cannot finish off, he does, and he does it very well.
Of course, he's also valuable for allowing a quick, easy sweep of the opponent's team if ever he manages to get a Sword's Dance or two up. :)
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My Hate List
There are only two pokemon that make me groan when they appear, as they are the biggest threats to my team and I have no easy answer for them. They are:
Togekiss, in any form, is a huge threat as none of my pokemon can OHKO it, nor can any of them resist air slash. Plus, thunder wave and/or aura sphere make both Gengar and Lucario risky switch-ins. Therefore, I usually have to rely on Swampert to at least weaken it first. That, unfortunately, is easier said than done due to Flinch-Hax. As long as I get at least one avalanche off I can switch into Lucario (or Gengar, if it's not scarfed or if it tricked it away already) and finish it off. This will still leave me quite wounded even in the best of situations however.
Breloom, ugh... There's no sleep clause in WiFi battles so there's nothing stopping him from sporing my entire team down. Gengar can wall both common Breloom variants (Leech Seed or Seed Bomb in the final slot), but only if Spore isn't in the picture. Sometimes I get lucky and the A.I. chooses not to use Spore every chance it gets, but not always, and that's when it's a BIG problem.
It's generally easy to subdue if it comes out against Lucario or Gengar, as Lucario can OHKO it and Gengar can usually bring it low enough to stop a substitute (which it seems to like to do more than Spore, thankfully), but usually it shows up as their first pokemon or when my Swampert is out, forcing a switch and a free-turn setup for this nasty, nasty pokemon. :(
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Alas, this team only got to round 52 before it got creamed by a double-grass team in single battles. I can't predict as well there, as unfamiliar pokemon/combos are used, and therefore I don't think this team has what it takes for single battles. :(
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Well that's it! I hope I did everything right and didn't leave anything out. I am writing this half-asleep so if I forgot something important I do apologize!
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This team is currently Rank 10 - Steak 42 on WiFi battles, but only managed 52 on single battles thanks to a double grass team. :( But more on that later. For now, the proud-to-be champions:

Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP/252 Def/4 SpD
Nature: Impish
Waterfall
Avalanche
Earthquake
Protect
Swampert is, in my opinion, one of the best leads for WiFi battles! He walls three of the most commonly used pokemon (Metagross, Garchomp, and Tyranitar) with ease, along with many others!
Avalanche is a guaranteed OHKO on all three of the popular dragon types (Dragonite, Garchomp, Salamence) unless they are holding a Yache Berry or they used Dragon Dance/Sword's Dance instead of attacking (bloody Garchomps!!!) However, Swampert is bulky enough to take even a Sword's Danced Outrage from a Garchomp.
Protect is extremely useful (and necessary) for scouting for grass moves from common leads such as Infernape and Latios/Latias. Plus, it allows Swampert to maximize his HP gain against anything he can't straight up OHKO. It also walls Slaking perfectly, which seems to be a popular pokemon in WiFi battles for some reason.

Gengar @ Focus Sash
Ability: Levitate
EVs: 252 SpA/252 Spe/4 HP
Nature: Timid
Shadow Ball
Thunderbolt
Sucker Punch
Destiny Bond
Sucker Punch? Are you crazy!? - It is there for one reason and one reason only: Opposing Gengar. Due to the retarded WiFi rules about a tie being equal to a loss, an opposing Gengar won't hesitate to Destiny Bond even if we're both down to our last pokemon, therefore resulting in a loss and ending my streak. Sucker Punch deals quite well with any opposing Focus Sashed Gengar (or even ones with less-than-half HP) without having to roll the dice on a speed tie. Until I started using it, Gengar was the biggest threat to this team.
Aside from that, Gengar is a great sweeper and extremely useful for taking out big threats thanks to Destiny Bond and the A.I.'s inability to prevent itself from attacking into it. :)

Lucario @ Life Orb
Ability: Steadfast
EVs: 252 Atk/252 Spe/4 HP
Nature: Adamant
Close Combat
Crunch
Extreme Speed
Sword's Dance
Due to Lucario's weaknesses and general frailness, he isn't the ideal choice for switching in against most common pokemon in WiFi battles. However, that is not his job. His role is pivotal in that whatever Swampert or Gengar cannot finish off, he does, and he does it very well.
Of course, he's also valuable for allowing a quick, easy sweep of the opponent's team if ever he manages to get a Sword's Dance or two up. :)
-------------
My Hate List
There are only two pokemon that make me groan when they appear, as they are the biggest threats to my team and I have no easy answer for them. They are:

Togekiss, in any form, is a huge threat as none of my pokemon can OHKO it, nor can any of them resist air slash. Plus, thunder wave and/or aura sphere make both Gengar and Lucario risky switch-ins. Therefore, I usually have to rely on Swampert to at least weaken it first. That, unfortunately, is easier said than done due to Flinch-Hax. As long as I get at least one avalanche off I can switch into Lucario (or Gengar, if it's not scarfed or if it tricked it away already) and finish it off. This will still leave me quite wounded even in the best of situations however.

Breloom, ugh... There's no sleep clause in WiFi battles so there's nothing stopping him from sporing my entire team down. Gengar can wall both common Breloom variants (Leech Seed or Seed Bomb in the final slot), but only if Spore isn't in the picture. Sometimes I get lucky and the A.I. chooses not to use Spore every chance it gets, but not always, and that's when it's a BIG problem.
It's generally easy to subdue if it comes out against Lucario or Gengar, as Lucario can OHKO it and Gengar can usually bring it low enough to stop a substitute (which it seems to like to do more than Spore, thankfully), but usually it shows up as their first pokemon or when my Swampert is out, forcing a switch and a free-turn setup for this nasty, nasty pokemon. :(
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Alas, this team only got to round 52 before it got creamed by a double-grass team in single battles. I can't predict as well there, as unfamiliar pokemon/combos are used, and therefore I don't think this team has what it takes for single battles. :(
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Well that's it! I hope I did everything right and didn't leave anything out. I am writing this half-asleep so if I forgot something important I do apologize!