I haven't tried that but is there any particular reason you want to do it there? I only mentioned the part about not being in Lance's room yet because if he was he would have to go through the Elite Four again to get the Chatots in the party.
Could I ask you something?
When you said:
"If you weren't in Lance's room yet you could use a Chatot or two with a custom chatter. Yes they work in 4th gen too. Every time you load the summary the RNG advances 1 frame so you can switch between two different Chatots fairly quickly to advance the frames."
Could you do that while in Karen's room?