The Pink Wall

The Pink Wall is a small room full of Clefairy and Cleffa at Level 100. They know Light Screen, Reflect, Moonlight, and Minimize. There are 18 Clefairy and 2 Cleffa. They ability Friend Guard Helps them take smaller amounts of damage with more allies around, as well as having Cute Charm to infatuate you(since some Clefairys and Cleffas are male, some are female) alongside having Light Screen to raise Special Defense of all the Clefairy and Cleffa and Reflect to raise Defense of all the Clefairy and Cleffa, hence why it is difficult. The best way is to go in with something that has Mold Breaker that can spam an AOE, which will bypass their Friend Guard abilities, however Cute Charm can still take effect, and light screen and reflect can still lower the damage you give them. Pinsir would be the wisest choice as it gets the ability Mold Breaker, and with its family item, the Pinsir Sash, its moves will not be affected by Light Screen or Reflect. However, Cute Charm can still be a problem. You can also bring items into the Pink Wall and give up if you please! Good luck against it!