Sands of the West Chapter 2: Redfang
Fortunately, the store opened early - and was managed by someone far less grouchy than the kecleon the day before.
Pokemon - Tale Of The Guardian Master - CH 66
"when work on this began, it was originally called the kecleon project... our primary goal was to create a machine capable of swapping any ability and/or move between pokemon, and give them this ability or move permanently...