Instructions
Select your strongest Bug-type Pokémon as the party leader. The first Kimono Girl fields a level 38 Umbreon and the second fields a level 38 Espeon, both of which are weak to Bug attacks.
Use a Ground-type Pokémon as your second party member. The next Kimono Girl uses a level 38 Flareon and the fourth fields a 38 Jolteon. Fire and Electric-types are both weak to Ground attacks.
Set a Grass or Electric-type Pokémon as the third party member. You will only have to deal with one more Kimono Girl and her level 38 Vaperon, a Water-type easily defeated by Grass or Electric attacks.
Enter battles with this battle party setup until all three of your chosen Pokémon are at least level 40, at which point you should have no trouble defeating the Kimono Girls.