unanswered Two-Trainer Double Battles in B&W

Dear all,

Pokémon Black 2 & White 2 introduced the two-trainer Double Battles for another time.

These are battles in which two different Trainers spot you at the same time and they will team up.

This battling style was first introduced in Pokémon Emerald and exaggeratingly used in that game.

In Pokémon B2&W2, the battle style was reintroduced, whereas Pokémon B&W will give an error

if two Trainers spot you at the same time.

Now, I would really like to implement this battle style in Pokémon B&W. My question is, will this

be a matter of copying a certain .narc file from B2&W2 to Pokémon B&W to make this function?

Thank you very much for any help on this.

Oxnite