I've read that when Kids' WB aired "Meowth's Party" and "PokéRap GS" in place of Pikachu's Jukebox and Pokémon Karaokemon, there were little eyecatches similar to those used for the normal music video segments. Something along the lines of "Don't go away, Meowth's Party is next." I guess the only way to find these is to find complete, commercials-included recordings of the original airings of the specific episodes (Pokémon Food Fight! on August 19, 2000, The Pokémon Water War on August 26, 2000 and Hot Matches! on May 12, 2001).
Anyone have old Kids' WB tapes lying around? What upsets me is that I actually taped Pokémon in the morning before/during school using the VCR's timer semi-regularly for a while around the turn of the millennium, and none of those recordings survived.