Shiranui entered with Zoro using illusions to make the heroes invisible and Bakeru in the crook of his arm.  Using his [i]shinobi[/i] skills and Bakeru's malleability, he planted Bakeru in one of the cages and the Mimikyu quietly told the Pikachu within they'll be free shortly provided they too kept quiet.

Zoro's invisibility illusions were dispelled when the trainers started battling some of the guards and the Zoroark was luring some of the Dragalge away with his Taunt attacks and a Pikachu illusion, leaving Bakeru to take out the Drampa guards near his cage with some quick Play Rough attacks and zipping back into the cage after each defeat.

Shiranui had taken cover in the canopy of a tree after planting Bakeru and was watching the action unfold, trusting Zoro and Bakeru to execute their parts of the plan with autonomy and ready to call out Saisei if Mike's plan starts to unravel.