Hiyo! I'm kinda new to this site but I wanted to post my team here to get suggestions. I have a good amount of success with this team but there are a few things that completely destroy it, which I'll mention at the end. I like the format Support - Phys & Spec Sweeper - Tank - Drainer - Cleric, so I'll post them in that order:
@ Leftovers
Prankster
Bold Nature
::Spikes
::Reflect
::Light Screen
::Foul Play
EVs: 252 HP/252 Def/4 Spe
The four speed EVs are to outspeed other Klefki, but aside from that it's self-explanatory.
@ Life Orb
Moxie
Jolly Nature
::Outrage
::Earthquake
::Aqua Tail
::Dragon Tail
EVs: 252 Atk/4 SpD/252 Spe
4 in Special D to give Downloaders an Attack boost instead of Special Attack, Dragon Tail is for phazing.
@Eviolite
Analytic
Quiet Nature
::Recover
::Tri Attack
::Thunderbolt
::Ice Beam
EVs: 252 HP/252 SpA/4 SpD
Quiet to make sure he gets the Analytic boost. One thing I really want to replace is this guy, he hits hard but he's not really a sweeper, more of a tank, and the Ghost immunity hasn't proven as useful as I thought it would.
@ Assault Vest/Life Orb
Thick Fat
Adamant Nature
::Earthquake
::Stone Edge
::Icicle Crash
::Ice Shard
248 HP/252 Atk/8 SpD
Tank, hits hard. AV was an experiment to see how a Fire-Resistance would do for him (hasn't worked too well, considering Life Orb)
@ Sitrus Berry
Harvest
Impish Nature
::Substitute
::Leech Seed
::Will-o-Wisp
::Horn Leech
EVs: 252 HP/4 Atk/252 Def
I love this thing!! I prefer Horn Leech over Phantom Force, to do immediate damage and recover more HP. He has a good Attack stat so it works well
@ LEftovers
Synchronize
Careful Nature
::Payback
::Curse
::Moonlight
::Heal Bell
252 HP/4 Atk/252 SpD
This is actually what I based the team on. I used a similar team before with Blissey in this role, but Psyshock was a major problem, so this covers that by being immune and being able to wall the attacks that would use Psyshock, ie Espeon or Alazkazam.
Main Problems:
I'll try to break it down as much as possible: First is that I need two reliable phazers, whereas I only have one that I would not call reliable. Boosting sweepers destroy this team, and with hazards up it adds residual damage.
Hazards! Klefki has actually not been fantastic at getting up Spikes, and I really want Stealth Rock in addition to Spikes somewhere on the team.
Rapid Spin is also missing. Hazards eat my team alive, because the strategy is to switch out of attacks to something that can take the hit (or is immune to it) and then do some damage/set up while they switch. (Ie, Trevenant comes in on Breloom and gets a Sub up while it switches, and then it gets a free Leech Seed/WoW on whatever comes in.)
Porygon2 is not the cleaner I need. Any recommendations would be awesome! It needs to have synergy with Trevenant and Umbreon (preferable, not a total deal breaker though)
I'd like to include a Mega here somewhere, but since my team requires a ton of synergy I can't use something that changes types like Pinsir.
Bear in Mind:
This team is only annoying because of all the immunities I've got here. I'd really like to keep every immunity I can, which is why I used Klefki for example (other Fairies don't work here).
I need Umbreon to stay. If you'd like to recommend a different set, that is alright (this set ins't great anyways) but Umbreon is what saved this team style for me.
My strategy is to be as annoying as possible by switching out and predicting attacks, so I can switch to something with an immunity and then get a free turn while they switch out (hopefully).
Soo that's it :) I'd really like to hear recommendations from the experienced Smogon battlers as to what I should add or change here. I will add a replay as soon as I can so you can see how it functions as well. Please be as honest as you can too xD
EDIT: I hope it was clear that I've used this team before on Showdown, I'm in the 1600s on the OU ladder, which I think is good considering I don't play it a lot at once (A few battles per day, not too much though)
Replays:
http://replay.pokemonshowdown.com/ou-76290490 This one shows how I scout for attacks sometimes before switching, and gives good idea for my team I think

Prankster
Bold Nature
::Spikes
::Reflect
::Light Screen
::Foul Play
EVs: 252 HP/252 Def/4 Spe
The four speed EVs are to outspeed other Klefki, but aside from that it's self-explanatory.

Moxie
Jolly Nature
::Outrage
::Earthquake
::Aqua Tail
::Dragon Tail
EVs: 252 Atk/4 SpD/252 Spe
4 in Special D to give Downloaders an Attack boost instead of Special Attack, Dragon Tail is for phazing.

Analytic
Quiet Nature
::Recover
::Tri Attack
::Thunderbolt
::Ice Beam
EVs: 252 HP/252 SpA/4 SpD
Quiet to make sure he gets the Analytic boost. One thing I really want to replace is this guy, he hits hard but he's not really a sweeper, more of a tank, and the Ghost immunity hasn't proven as useful as I thought it would.

Thick Fat
Adamant Nature
::Earthquake
::Stone Edge
::Icicle Crash
::Ice Shard
248 HP/252 Atk/8 SpD
Tank, hits hard. AV was an experiment to see how a Fire-Resistance would do for him (hasn't worked too well, considering Life Orb)

Harvest
Impish Nature
::Substitute
::Leech Seed
::Will-o-Wisp
::Horn Leech
EVs: 252 HP/4 Atk/252 Def
I love this thing!! I prefer Horn Leech over Phantom Force, to do immediate damage and recover more HP. He has a good Attack stat so it works well

Synchronize
Careful Nature
::Payback
::Curse
::Moonlight
::Heal Bell
252 HP/4 Atk/252 SpD
This is actually what I based the team on. I used a similar team before with Blissey in this role, but Psyshock was a major problem, so this covers that by being immune and being able to wall the attacks that would use Psyshock, ie Espeon or Alazkazam.
Main Problems:
I'll try to break it down as much as possible: First is that I need two reliable phazers, whereas I only have one that I would not call reliable. Boosting sweepers destroy this team, and with hazards up it adds residual damage.
Hazards! Klefki has actually not been fantastic at getting up Spikes, and I really want Stealth Rock in addition to Spikes somewhere on the team.
Rapid Spin is also missing. Hazards eat my team alive, because the strategy is to switch out of attacks to something that can take the hit (or is immune to it) and then do some damage/set up while they switch. (Ie, Trevenant comes in on Breloom and gets a Sub up while it switches, and then it gets a free Leech Seed/WoW on whatever comes in.)
Porygon2 is not the cleaner I need. Any recommendations would be awesome! It needs to have synergy with Trevenant and Umbreon (preferable, not a total deal breaker though)
I'd like to include a Mega here somewhere, but since my team requires a ton of synergy I can't use something that changes types like Pinsir.
Bear in Mind:
This team is only annoying because of all the immunities I've got here. I'd really like to keep every immunity I can, which is why I used Klefki for example (other Fairies don't work here).
I need Umbreon to stay. If you'd like to recommend a different set, that is alright (this set ins't great anyways) but Umbreon is what saved this team style for me.
My strategy is to be as annoying as possible by switching out and predicting attacks, so I can switch to something with an immunity and then get a free turn while they switch out (hopefully).
Soo that's it :) I'd really like to hear recommendations from the experienced Smogon battlers as to what I should add or change here. I will add a replay as soon as I can so you can see how it functions as well. Please be as honest as you can too xD
EDIT: I hope it was clear that I've used this team before on Showdown, I'm in the 1600s on the OU ladder, which I think is good considering I don't play it a lot at once (A few battles per day, not too much though)
Replays:
http://replay.pokemonshowdown.com/ou-76290490 This one shows how I scout for attacks sometimes before switching, and gives good idea for my team I think
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