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He's right. Mach Punch + Belly Drum is illegal.
For Togekiss, give it Protect. When your opponents realize that you have Follow Me, they will double target Togekiss to try and take it out. Protect will make both of their moves fail, giving your partner a free turn to do whatever.
Your Togekiss EVs are bad. If you want to make a defensive, look at its HP compared to its Defense/Special Defense.
If HP < Defense/Special Defense, max out HP first (i.e. Shuckle, Dusknoir)
If HP > Defense/Special Defense, max out Defense/Special Defense first (i.e. Blissey, Vaporeon)
Since Togekiss's HP is less than its Defense and Sp Defense, you should put 252 EVs into HP.
What you really need is 3 Pokemon to make this work. Try this:
Lead with
Bronzong @Occa Berry
Brave Nature
Levitate
252 HP / 252 Atk / 4 Def
-Trick Room
-Explosion
-Gyro Ball
-Earthquake
Togekiss @Lum Berry
Sassy Nature
252 HP / 4 Def / 252 SDef
-Follow Me
-Protect
-Air Slash
-Reflect/Roost
Use Trick Room and Follow Me on the first turn, then Explosion and Protect on the second.
After that, bring in your Belly Drummer.
Snorlax @Sitrus Berry
Brave Nature
Thick Fat
252 Atk / 252 Def / 4 SpDef
-Belly Drum
-Return
-Earthquake
-Rock Slide
Snorlax is the slowest Belly Drummer and will virtually always go first during Trick Room. It's very sturdy and will survive long enough to use Belly Drum and heal instantly with Sitrus Berry when it's at half health. Return is for STAB, Earthquake and Rock Slide hit both opponents.
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