Chainsaw Meowth, who is being pranked by Joey gets fed up and yells:
"CALLING! YOU KEEP ON CALLING! YOU HEAR THE CALLING! LET ME GO!"
Suddenly, a rift to another dimension opens up and sucks Chainsaw Meowth in. On Joey's end, the rift opens as well. Kcalb escapes, but Joey is sucked in. The two rifts gradually begin getting larger, until it sucks in the Safari Zone whole, causing you to spin around and around in a twister-like sensation. The Shaymin comes into contact with a Gracidea Flower that was in the Safari Zone, goes Sky Form, and calls on other Shaymin's for help.
All the other Shaymin's close the rifts, but open a portal into the twister to rescue everyone. After everyone is rescued, you notice that all the helpful Shaymin's suddenly turned into worthless candy-canes because Arceus deemed he needed more candy canes. The only SHaymin left, the one we're fighting over in the first place, is in the hands of a certain Meowth with a chainsaw...
(who is currently hiding in Littleroot)