On the subject of Pokémon, I also know that "Memories are Made of Bliss!", the DP finale, has only aired three times in the US; its original airdate, once during a weekday run, and once on Boomerang. Because of the way they do Sunday reruns, it was skipped over so they could run "In The Shadow of Zekrom!", the BW premiere. After one complete weekday run of Sinnoh League Victors, they started DP over from "Following a Maiden's Voyage". After that, I think after the Ash vs. Paul episodes (or maybe even during them), they started showing BW on weekday mornings. So that episode only aired twice on CN, but aired once more on Boomerang.