Noticing that the group before them was too occupied with the battle, Riz waved her staff as it began glowing with a violet/indigo aura. After making some motions, at which the aura fully encompassed her, she pointed it at the Lucario specifically.
Shadow Pull!
Immediately, Lucy would find herself encompassed by a violet/indigo colored aura that would paralyze her fully, preventing any kind of movement or response. Then, almost as quickly as the initial attack's onset was, she would find herself being pulled with haste toward the source of the attack, which was the pair observing the fight at the moment. Face-to-face with the pair of girls, Aerys held her cute, if smug, grin while Riz maintained the paralyzing aura with her staff.
Sorry, but we'll need to borrow you for a moment. I promise we'll return you when we're done here.
Just don't struggle and you'll be fine. We just need to speak to the fine Trainers for a bit.
Lucy being dragged to the pair would be noticeable to all parties involved in the battle.