I'm Kecleon hunting and I need to know.
But there's an easier way to get a HA Kecleon, go to mossdeap and the space station and go to the astronaut suit and go behind it. You will then be refused to go directly behind it, press A and it will say there is an invisible object there. See what it is with the Devon Scope and it will be a HA Kecleon. Be sure to save before battling it first.