I haven't been playing very long, but this is my most successful team thus far. I made an attempt to avoid things that are currently ruling the metagame.
Flygon @ Choice Band
6 HP / 252 Atk / 252 Spe Jolly nature
Earthquake
Body Slam
Hidden Power Flying
Rock Slide
Earthquake and Rock Slide are obvious. HP Flying is because Hera beats a lot of my team, and it helps for the odd Breloom. Body Slam is for hax on Ninjask's baton pass, but as a filler move I thought it was better than slightly more damaging Return. I guess Double-Edge is an option.
Dragonite @ Leftovers
120 HP / 64 Atk / 4 Spe / 252 SpA / 68 SpD Quiet Nature
Substitute
Focus Punch
Ice Beam
Thuderbolt
Blah it's a standard, but as of the time I started Dragonite was virtually nonexistent :). Hes a good counter to Salamence, Gyrados, and Skarmory, and can punch a lot of stuff if he gets a sub up, which isn't hard to do.
Articuno @ Leftovers
249 HP / 12 Spe / 249 SpD Calm Nature
Ice Beam
Roar
Toxic
Heal Bell
I know Articuno is usually a shuffler, not a wall, but he can poison and outstall bulky waters with some Wish support, as well as phazing calm minders who aren't Raikou (hence the EV's). Heal Bell works well enough on him, considering this isn't a stall team.
Steelix @ Leftovers
252 HP / 160 Atk / 96 SpD Impish Nature
Earthquake
Rock Slide
Roar
Screech
He helps Articuno with electric types and counters Ttar and Metagross. Attack Ev's give him a decent chance to OHKO Dugtrio. Most Curselax are walled by either him or Gengar. Screech has saved me several times against endgame Curselax.
Gengar @ Choice Band
6 HP / 252 Atk / 252 Spe Adamant Nature
Sludge Bomb
Shadow Ball
Focus Punch
Will-o-Wisp
CB Gengar is fun. Shadow Ball is mostly for other Gengar, but hits a lot of things that might try to switch in on Sludge Bomb neutrally. Focus Punch is really useful with all of his resistances. Will-o-Wisp is good for Metagross switch-ins or coming against a Snorlax using curse or a normal attack and burning before he shadow balls.
Vaporeon @ leftovers
253 HP / 60 Def / 184 SpA / 31 SpD
Surf
Ice Beam
Hidden Power Electric
Wish
Offensive Vappy. Not as effective of a team healer as the standard, but with his awesome ability to switch in on bulky waters, its cool to let him do some damage as well. He is a great switch-in on Gyrados, who will usually taunt and get hit. Surf is pretty poweful, and Surf + HP electric KO's Starmie.
So thats the team, the things that make it the saddest are Starmie, Gengar, and sandstorm teams with like 6+ walls. 2/3 of it is immune to spikes, which helps in general. It's beaten a lot of teams that are loaded with standards though. The main point is it has a lot of ice and electric attacks, which beat a lot of the things that stop a late game Flygon sweep.
Flygon @ Choice Band
6 HP / 252 Atk / 252 Spe Jolly nature
Earthquake
Body Slam
Hidden Power Flying
Rock Slide
Earthquake and Rock Slide are obvious. HP Flying is because Hera beats a lot of my team, and it helps for the odd Breloom. Body Slam is for hax on Ninjask's baton pass, but as a filler move I thought it was better than slightly more damaging Return. I guess Double-Edge is an option.
Dragonite @ Leftovers
120 HP / 64 Atk / 4 Spe / 252 SpA / 68 SpD Quiet Nature
Substitute
Focus Punch
Ice Beam
Thuderbolt
Blah it's a standard, but as of the time I started Dragonite was virtually nonexistent :). Hes a good counter to Salamence, Gyrados, and Skarmory, and can punch a lot of stuff if he gets a sub up, which isn't hard to do.
Articuno @ Leftovers
249 HP / 12 Spe / 249 SpD Calm Nature
Ice Beam
Roar
Toxic
Heal Bell
I know Articuno is usually a shuffler, not a wall, but he can poison and outstall bulky waters with some Wish support, as well as phazing calm minders who aren't Raikou (hence the EV's). Heal Bell works well enough on him, considering this isn't a stall team.
Steelix @ Leftovers
252 HP / 160 Atk / 96 SpD Impish Nature
Earthquake
Rock Slide
Roar
Screech
He helps Articuno with electric types and counters Ttar and Metagross. Attack Ev's give him a decent chance to OHKO Dugtrio. Most Curselax are walled by either him or Gengar. Screech has saved me several times against endgame Curselax.
Gengar @ Choice Band
6 HP / 252 Atk / 252 Spe Adamant Nature
Sludge Bomb
Shadow Ball
Focus Punch
Will-o-Wisp
CB Gengar is fun. Shadow Ball is mostly for other Gengar, but hits a lot of things that might try to switch in on Sludge Bomb neutrally. Focus Punch is really useful with all of his resistances. Will-o-Wisp is good for Metagross switch-ins or coming against a Snorlax using curse or a normal attack and burning before he shadow balls.
Vaporeon @ leftovers
253 HP / 60 Def / 184 SpA / 31 SpD
Surf
Ice Beam
Hidden Power Electric
Wish
Offensive Vappy. Not as effective of a team healer as the standard, but with his awesome ability to switch in on bulky waters, its cool to let him do some damage as well. He is a great switch-in on Gyrados, who will usually taunt and get hit. Surf is pretty poweful, and Surf + HP electric KO's Starmie.
So thats the team, the things that make it the saddest are Starmie, Gengar, and sandstorm teams with like 6+ walls. 2/3 of it is immune to spikes, which helps in general. It's beaten a lot of teams that are loaded with standards though. The main point is it has a lot of ice and electric attacks, which beat a lot of the things that stop a late game Flygon sweep.