What to learn a way to steal from Kecleon without being KO or haveing all your item's turned into Plain seed's? Well this is how:
-Get a ghost pokemon(I have a Gengar)
-Find a Shop in a dungeon
-take all the item's (Optional)
-Don't pay and Kecleon will yell,"Theif! Theif!"
-Since your a ghost walk through the walls (It Rocks!)
-Kecleon Cannot follow you
-And Find the stairs WITHOUT leaving the walls(or else Kecleon copies with chase and attack you!!
-Once you find the stairs check to see if there are any Kecleon and make a mad dash to the next floor.
There you have it, That's how to do it goodbye.