You don't remember the Volbeat/Illumise episode, cold_katanagirl? Here's the summary:
Ash and friends arrived at a lake. Oddly enough, the lake was called Lake May. (which is totally for fun, I think) There, Ash, May, Max, and Brock notice a Pok?mon over the lake. It was someone's Illumise. They also managed to see a Volbeat. It was seemingly doing a dance. On a pier in the lake, Ash and friends find Romeo and Juliet, Trainers of Volbeat and Illumise, respectfully. After a short chat on practicing for their performance later that night, Juliet tells Romeo to release his other Volbeat. he did so, but quickly lost command over the Pok?mon. All five fell in the lake, but Ash and friends quickly aid them. Romeo tries desperately to save the Pok?mon, but it turns out he couldn't swim, so they had to drag him out...
Later, Romeo talks to Ash and friends (after Juliet left) about what just happened. Normally, he trains great with his Volbeat, but whenever he's near Juliet, he goes completely nervous, not able to give commands as well as unable to control them. May quickly diagnoses Romeo's sickness as love-sickness. Ash, like always, was too dense to catch any of it. To cure Romeo of his stage fright with Juliet, May proposes a plan.
Romeo tries the lines that May taught him to Juliet, who was now on a porch. He was stuttering everywhere, and Juliet gets angry. It turns out that they were just practicing, and Ash was the unfortunate actor of Juliet. Brock attepts to show Romeo how to talk with feeling, but this time he went WAY too far. Imaniging that Juliet was actually there, he chased Ash everywhere.
That night, Juilet was wondering why Romeo was acting all wierd. She thought of the moment when they were little kids. Little Juliet said to little Romeo that they were perfect for each other, and should marry when they grow up. At that time, Romeo had absolutely no fear. That memory quickly faded as she saw a light over the lake. Thinking that it was one of Romeo's Volbeat training, she quickly told Illumise to see what they were doing. After a moment, both lights over the lake faded. It was none other than Team Rocket. (of course, she didn't know that)
She ran to where Romeo and Ash and friends were. By that time, it was morning. Unfortunately for Romeo, she nearly interupted his practice to profess his love for her. She hid, but the situation grew dire, and she finally walked from her cover behind some trees after Romeo finished. She asked them where her Illumise was. Before long, Team Rocket appeared, saying their motto like always, and managed to get a hold of Pikachu as well. Romeo, after gaining courage, released his five Volbeat, attacked Team Rocket mercilessly, and blew them sky-high with Psybeam.
After the battle, Romeo finally mustered the courage to propose to Juliet. Of course, she accepted, and both became very happy. Ash was still clueless as to what just happened! That night, Ash and friends saw Romeo and Juliet perform the Volbeat/Illumise dance in the night sky.
Whew! Hope I got the main details down. Anyways, throughout the entire episode, there were many hints that relates to Ash and Misty's old friendship. Also to consider, 4Kids decided to release this episode after Misty made her guest appearence in Hoenn, although in Japan, this episode was release before Kasumi's appearence.