Lure her into a trap

You had glanced around before talking to Tina. While there were security cameras watching the doors and the merchandise, you had realized there weren't any cameras watching the area around the bathrooms. It was still a risk, but you would have plausible deniability and no one would have reason to think of someone catching her in a pokeball.

"Sorry to bother you, but I think there's something leaking under the bathroom doors." You lied.

"What?" She got up and hurried over towards the bathrooms, and you followed. "Groudon's oversize rear!" She slowed down as she got close. "Where did you see-?"

As she started to turn towards you, you cut her question off by tapping a pokeball against her back. She disappeared in a flash of light. This had better work or you were going to have so much trouble getting out of this...

The ball shook once in your hand.

Twice.

Three times.

It clicked.

You breathed a sigh of relief, then grinned.