First You Need:
#1 WireLess Router

  

How To Do The Glitch:
#1 Go To Jubilife City
#2 Connect To The GTS(Global Trade Station
#3 Deposit The Pokemon You Wanna Clone
Note: Ask For A LV.100 Or LV.9 Under Darkrai Or Any LV. 9 Under Legendary(Except Jirachi)
#5 After 5 Seconds,Look At The WLAN(Light That Blinks On The Router)On Your Router.If It
Blinks Turn Off Your DS

#6 Turn You DS Back On.It Will Say "The Save File Is Corrupted,The Game Will Be
Loaded.
#7 Connect To The GTS Again.If It Says Summary,You Did It Right.Press Summary And WithDraw
Your Pokemon.

If It Says Deposit...
Close All The Programs On Your Computer And Do Step#1-7

THIS GLITCH IS SAFE<table class="table_ch"></table>