EDIT: You can actually have the same Pokemon in two different areas? Whoa...
All right, I apolgize. If nobody noticed that, I'll try to appeal with my Piplup.
Monica! Use Aqua Ring to form a ring of water around you, then freeze it with Blizard, and finally use Metal Claw to tear it to pieces and send the pieces flying into the air to form an icy ring in the sky!
Aqua Ring - Blizzard - Metal Claw