Hey,
So I'm sort of newish to pokemon, especailly to double battles, but here is my best attempt at a good double battle team. Also, it's important to note I've made this team with a teammate, so It is split into two groups of three.
The idea behind the set is that Ninjask will pass speed and swords to Metagross, who, along with Medicham, will become a monstrous sweeper. On turn one, normally, Ninjask would use Protect while Clefable uses either Reflect or Lightscreen, depending on the need. Togekiss would then use follow me while Ninjask Swords Danced. On the following turn Ninjask would either baton pass to Metagross, or Swords Dance again. Metagross could start sweeping while hopefully having a few more turns of follow-me support. Once it runs out of Follow-Me support, it's time for Medicham to join in the fight! Medicham could either Pysch-Up to gain Metagross's speed and attack, or put his already magnificent 480 attack to good use immediately.
Ninjask is almost guaranteed to pass +2 Att, and +2 Spe, unless the opponent brings 2 double hitters (like surf or discharge), in which case Ninjask could Baton-Pass early to Celebi, who could rack up the Att boost. Substitute and Lum berries on Clefable are for dealing with choice scarfed Brelooms leads and the like. On turn 1 Ninjask would protect, and Clefable would use Substitute. Either the opposing Breloom goes after the Ninjask, in which case no problem, or he goes after Clefable, in which case Lum berry kicks in, and then a sub goes up. Safeguard could also be used instead for similar effects.
The teams does have some major threats to it. A taunt on Clefable or Togekiss will shut them down. Multi-target moves, as previously stated, can really hurt this team. Heatwave, Eruption, and lava plume especially kill this team as Ninjask, Celebi, and Metagross are all weak to them. Haze will also shut this team down very easily.
So what do you guys think? I know it might not be very good, but this is my first double battle team. I'm also not quite sure how to invest Clefable/Celebi/Togekiss' defensive EVs for maximum defenses, and Celebi, and Medicham don't seem to be as usefull as they could be to the team...
So I'm sort of newish to pokemon, especailly to double battles, but here is my best attempt at a good double battle team. Also, it's important to note I've made this team with a teammate, so It is split into two groups of three.
On one side:
The Swords/Speed Passer
Ninjask - Focus Sash
Jolly, 252 Att, 252 Spe, 4 HP
Swords Dance
X-scissor
Protect
Baton Pass
Ninjask's Role Is to pass speed and Swords Dance to Metagross, and It is almost guaranteed that he can pass +2 in both of these. He can also do decent damage after a Swords Dance with X-Scissor. Protect allows him to stall while getting speed boosts. He can also Swords Dance while under the cover of Follow-Me from a team mate. Focus Sash ensures any multi-target move doesn't kill him.
The Backup Swords Dance (?)
Celebi - Leftovers
Impish, 112 HP, 144, Def, 252 Spd
Swords dance
Recover
Seed bomb
Baton pass
In a nightmare scenario in which Ninjask is teamed up on by two Multi-target move users, he can at least pass some speed, to Celebi who could in turn pass swords to Metagross. She also has the ability to go on the offensive herself, and stab'd seed bomb does decent damage. With her bulk she can often set herself up if needed, especially with recover, and do some damage of her own using seed bomb.
The Sweeper
Metagross - Life orb
252 Att, 252 HP, 4 SpD
Bullet Punch
Earthquake
Thunder punch
Ice punch
Metagross' aim is to get passed speed and attack from ninjask, and then sweep. This set gives Metagross great coverage, and also allows him to use earthquake while Togekiss is out, or when Medicham uses Protect. with 810 attack after one swords dance Metagross can easily OHK almost anything it hits for neutral damage. It's also bulky enough that it can take a hit.
On the other side:
The Attention Seeker
Clefable -Lum Berry
Bold, 252 HP, 152 Def, 104 Spd.
Follow Me
Light Screen
Reflect
Substitute
Clefable is cable of set up screens rather effectively, especially if your opponents attack a protecting ninjask on the first turn, as they often do. Clefable' real goal however is to protect Ninjask while he passes stat boosts. and I mean just look at her picture! She's clearly a drama-queen! She can also protect herself from an opponent trying to put her to sleep with substitute, after being woken up by a lum berry.
The Second Attention Seekekr
Togekiss - leftovers
Calm, 252 HP, 252 Spd, 4 def.
Protect
Extreme-speed
Roost
Follow Me
Togekiss is superior to Clefable both in bulkiness and in the fact that she allows Metagross to use earthquake. She is harder to kill, and can heal with roost, which removes most of her weaknesses. In a pinch she could finish off an enemy with extreme-speed, or break a shash, but not much else.
The Second Sweeper
Medicham - Focus Sash
Adamant, 252 Att, 252 Spe, 4 Spd
Psych Up
Bullet Punch
Hi-Jump-Kick
Rockslide
Finally we have Medicham, who is capable of aiding in a sweep even without a boost, but can also copy Metagross'. Hi-Jump-Kick is downright deadly with stab behind it, and rockslide allows Medicham to hit both enemies, and bullet punch has priority.
The Swords/Speed Passer

Ninjask - Focus Sash
Jolly, 252 Att, 252 Spe, 4 HP
Swords Dance
X-scissor
Protect
Baton Pass
Ninjask's Role Is to pass speed and Swords Dance to Metagross, and It is almost guaranteed that he can pass +2 in both of these. He can also do decent damage after a Swords Dance with X-Scissor. Protect allows him to stall while getting speed boosts. He can also Swords Dance while under the cover of Follow-Me from a team mate. Focus Sash ensures any multi-target move doesn't kill him.
The Backup Swords Dance (?)

Celebi - Leftovers
Impish, 112 HP, 144, Def, 252 Spd
Swords dance
Recover
Seed bomb
Baton pass
In a nightmare scenario in which Ninjask is teamed up on by two Multi-target move users, he can at least pass some speed, to Celebi who could in turn pass swords to Metagross. She also has the ability to go on the offensive herself, and stab'd seed bomb does decent damage. With her bulk she can often set herself up if needed, especially with recover, and do some damage of her own using seed bomb.
The Sweeper

Metagross - Life orb
252 Att, 252 HP, 4 SpD
Bullet Punch
Earthquake
Thunder punch
Ice punch
Metagross' aim is to get passed speed and attack from ninjask, and then sweep. This set gives Metagross great coverage, and also allows him to use earthquake while Togekiss is out, or when Medicham uses Protect. with 810 attack after one swords dance Metagross can easily OHK almost anything it hits for neutral damage. It's also bulky enough that it can take a hit.
On the other side:
The Attention Seeker

Clefable -Lum Berry
Bold, 252 HP, 152 Def, 104 Spd.
Follow Me
Light Screen
Reflect
Substitute
Clefable is cable of set up screens rather effectively, especially if your opponents attack a protecting ninjask on the first turn, as they often do. Clefable' real goal however is to protect Ninjask while he passes stat boosts. and I mean just look at her picture! She's clearly a drama-queen! She can also protect herself from an opponent trying to put her to sleep with substitute, after being woken up by a lum berry.
The Second Attention Seekekr

Togekiss - leftovers
Calm, 252 HP, 252 Spd, 4 def.
Protect
Extreme-speed
Roost
Follow Me
Togekiss is superior to Clefable both in bulkiness and in the fact that she allows Metagross to use earthquake. She is harder to kill, and can heal with roost, which removes most of her weaknesses. In a pinch she could finish off an enemy with extreme-speed, or break a shash, but not much else.
The Second Sweeper

Medicham - Focus Sash
Adamant, 252 Att, 252 Spe, 4 Spd
Psych Up
Bullet Punch
Hi-Jump-Kick
Rockslide
Finally we have Medicham, who is capable of aiding in a sweep even without a boost, but can also copy Metagross'. Hi-Jump-Kick is downright deadly with stab behind it, and rockslide allows Medicham to hit both enemies, and bullet punch has priority.
The idea behind the set is that Ninjask will pass speed and swords to Metagross, who, along with Medicham, will become a monstrous sweeper. On turn one, normally, Ninjask would use Protect while Clefable uses either Reflect or Lightscreen, depending on the need. Togekiss would then use follow me while Ninjask Swords Danced. On the following turn Ninjask would either baton pass to Metagross, or Swords Dance again. Metagross could start sweeping while hopefully having a few more turns of follow-me support. Once it runs out of Follow-Me support, it's time for Medicham to join in the fight! Medicham could either Pysch-Up to gain Metagross's speed and attack, or put his already magnificent 480 attack to good use immediately.
Ninjask is almost guaranteed to pass +2 Att, and +2 Spe, unless the opponent brings 2 double hitters (like surf or discharge), in which case Ninjask could Baton-Pass early to Celebi, who could rack up the Att boost. Substitute and Lum berries on Clefable are for dealing with choice scarfed Brelooms leads and the like. On turn 1 Ninjask would protect, and Clefable would use Substitute. Either the opposing Breloom goes after the Ninjask, in which case no problem, or he goes after Clefable, in which case Lum berry kicks in, and then a sub goes up. Safeguard could also be used instead for similar effects.
The teams does have some major threats to it. A taunt on Clefable or Togekiss will shut them down. Multi-target moves, as previously stated, can really hurt this team. Heatwave, Eruption, and lava plume especially kill this team as Ninjask, Celebi, and Metagross are all weak to them. Haze will also shut this team down very easily.
So what do you guys think? I know it might not be very good, but this is my first double battle team. I'm also not quite sure how to invest Clefable/Celebi/Togekiss' defensive EVs for maximum defenses, and Celebi, and Medicham don't seem to be as usefull as they could be to the team...