Guys, you need to post the sets with proper explanations to count as a nom!
Umbreon @ Leftovers
Trait: Synchronize
EVs: 252 HP / 72 Def / 184 Spe
Bold Nature (+Def, -Atk)
~ Baton Pass
~ Mean Look
~ Taunt
~ Wish
Chaosbreon! It's a pretty mean strategy; Mean Look, Taunt, and Baton Pass to a counter - rinse and repeat. It also doubles up as a Wish passer ;d This Umbreon is usually paired with Perish Song Celebi.
Slaking @ Choice Band
Trait: Traunt
EVs: 4 HP / 252 Atk / 252 Spe
Adamant or Jolly Nature
~ Earthquake
~ Focus Punch / Fury Swipes
~ Return / Double-Edge
~ Shadow Ball
All vets use CB King, lol. It's pretty hard to make a team around this mon, so it will be a good challenge, imo. Whenever I make a CB Slaking team, they always end up defensive. Focus Punch is great to nail Skarmory and Forretress, but Fury Swipes is useful to break Substitute.
Zapdos @ Leftovers
Trait: Pressure
EVs: 96 HP / 252 SpA / 160 Spe
Timid or Modest Nature
~ Metal Sound
~ Thunderbolt
~ Hidden Power [Ice / Grass]
~ Roar / Toxic / Thunder Wave / Baton Pass / Rest
Metal Sound Zapdos :d I have used Metal Sound Magneton to great success, and can only imagine Zapdos pulling it off much better. Most Zapdos are specially defensive, so this would be a nice take of this Pokemon.
Machamp @ Leftovers
Trait: Guts
EVs: 252 HP / 252 Atk (I dunno)
Adamant Nature prolly
~ Bulk Up
~ Cross Chop
~ Hidden Power [Bug / Ghost]
~ Rock Slide
I almost lost to this thing - it can be quite scary once it gets going. Not sure what the EVs were. With Snorlax and especially Tyranitar being so prevalent in this metagame, it should not be hard for Machamp to find an opportunity to start bulking up.
Dragonite @ Leftovers
Trait: Inner Focus
EVs: 132 HP / 108 Atk / 48 SpA / 4 SpD / 216 Spe
Lonely or Adamant Nature
~ Dragon Dance
~ Earthquake
~ Hidden Power [Flying]
~ Thunder / Double-Edge
Dragonite has been overshadowed by Salamence, but it does have some perks, such as being pretty sturdy on the specially defensive side - iirc with those defensive EVs, it has no problems surviving non-STAB Ice Beams. Enough Speed to outrun CB Dugtrio after a DD. Thunder does hefty damage to Milotic (38~45%) and Suicune (39~47%) and obviously Skarmory and Gyarados. Double-Edge, however is better against Swampert and Zapdos. A double-dragon may not be a bad concept here.
Snorlax @ Leftovers
Trait: Thick Fat
EVs: 148 HP / 100 Atk / 160 Def / 96 SpD / 4 Spe
Careful Nature (+SpD, -SpA)
~ Belly Drum
~ Rest
~ Return / Body Slam
~ Shadow Ball / Earthquake
Baller set - experimented this post-ADV and it was decent. Obviously you'd want a back-up Pokemon to deal with dangerous special threats. Try Leech-stalling against this Celebi!
Electabuzz @ Leftovers
Trait: Static
EVs: 8 HP / 140 Atk / 240 SpA / 120 Spe
Hasty Nature (+Spe, -Def)
~ Cross Chop
~ Ice Punch
~ Substitute / Hidden Power [Grass]
~ Thunder
Electabuzz has that nifty Speed and great coverage to be a surprisingly viable mon, imo. Ice Punch is nice to nail Salamence and Celebi, while Cross Chop punishes Magneton, Blissey, Snorlax, and Tyranitar. Not many Pokemon enjoys taking STAB Thunder from this thing. Substitute is to ease prediction and to prevent revenge-killing from Dugtrio. Bulky mons like ZAPDOS, Swampert (without HP Grass), Celebi, and Snorlax are still hard to take down with Electabuzz's offense, but with some offensive partners and lures Electabuzz can pull some mid- late-game sweep.