The core idea is that: the more the sing and dance, the stronger they become, but to make it fair of course they start out with very low stats



I think you either slap a Throat Spray on them and turn them into Boom-burst machines, or you try to lean in their individual type strength, wide coverage and general unpredictable factor to make them hard to answer effectively.

  
I think Blue girl would be terrific on Rain Teams I assume, Red Girl might just be the strongest one since she has the widest move-pool and Extreme Speed Priority (can even set up Sticky Web), Yellow Girl can use Revelation Dance to have a perfect accuracy 90 power rock move that boosts her special attack by one stage and Gigaton Hammer coming off an actual attack stat that easily gets boosted could really sting. Purple and Pink can Sword Dance and go to +2 attack +1 Defense + Special Defense and + 1 Speed in a single turn  which is certainly quick set-up but their types are really bad since they are full of weaknesses.



Not sure if with all of the tools that I gave them they can make up for their very low and poorly optimized stats. What do you think? You'd put them on your team (VGC or singles)? 

Princession Orchestra as Pokemon: low stats but an ability that lets them stack boost EXTREMELY easily when using SOUND or DANCE moves. How good would they be in your opinion?