Okay, this might have been a filler, but this is one of those things when it is a very serious filler. Now, there were some funny parts (the whole Meowth's blue overlay running gag was a little funny), the TR peeling off the tree part was hilarious, and during the part after that, I was paying attention to half of what TR was saying..because of Wobbuffet's dancing!
Of course, the insert song almost made me cry, but I'm glad Ash got his best friend back.
This episode had elements from other episodes:
Gotta Dance!-Wobbuffet's Dancing
Whiscash and Ash-Ash being saved from drowning by a Pikachu (last time, Pikachu bait)
Pikachu's Goodbye-Insert Song, and Pikachu almost going away for good.
This episode wasn't as much of a tear-jerker as the Togepi Saga's ending but still, this was pretty seriously, the best Pokemon episode EVAR!!!
11/10