Yanmega/Vespiquen (Standard 2016/2017)
Pokemon (25)
4 Combee AOR 9/98
4 Vespiquen AOR 10/98
4 Yanma STS 6/114
4 Yanmega STS 7/114
3 Yanmega Break STS 8/114
4 Unown AOR 30/98
2 Klefki STS 80/114
Trainers (31)
1 Eco Arm
2 Level Ball
1 Revitalizer
1 Special Charge
3 Ultra Ball
4 VS Seeker
2 Lysandre
2 Judge
2 N
1 Pokemon Ranger
4 Professor Sycamore
4 Forest of Giant Plants
4 Bursting Balloon
Energy (4)
4 Double Colorless Energy
Changes / Techs
-2 Shaymin -> +1 Judge and Lysandre
-1 Ultra Ball -> +1 Klefki
This is my tested (against early-meta decks and finalized version of Vespiquen/Yanmega) for this Standard Season. Without Shaymins you force your opponent to go through 3-5 Yanmegas and 1-3 Vespiquens dealing high damage outputs. When you do the math, they waste more damage for small KO's. Play testing I realized Shaymin was hurting this deck more than helping. And, 25 Pokemon is more than sufficient for getting a decent damage output from your Vespiquen.
The General Strategy
Ramp up with FoGP and start swinging for 100-120 and spamming bursting balloons. Discard Pokemon that aren't useful. Even if you get stuck T1 with Unown or Klefki. It is fine because it gives you more set up time.
Yanmegas play early game, transition into late game with Vespiquen.
Thanks for reading!