Instructions
Turn the Wii console on by pressing the power button and select "Pokemon Rumble" from the home menu screen.
Press "A" and select your game file at the "Pokemon Rumble" title screen.
Make your way to the blue building at the bottom of the screen and press "A."
Select up to five Pokemon you wish to release. If your release a specific combination of Pokemon, you may receive a ticket.
Go to the "Random Recruiting" building and press "A" to redeem your ticket. You will then receive a Pokemon at a level that correlates to the specific floor that you are on.