Those were good.
Personally, I love some of the scenes with Pikachu from the original series. I loved the one time Pikachu was curious about a treadmill and ended up starting it. There's Pikachu running on its hind legs as fast as it can. Then Brock accidently hits a button on the treadmill, speeding it up, spending Pikachu flying off. Pikachu goes over and kicks the treadmill, only to collapse in pain. That was the Pokemon Tech episode.
I also loved Pikachu becoming attached to a bottle of ketchup in the episode where Ash and co. ended up in this town where two groups were fighting. Man Pikachu was devastated when the bottle broke.
Those were classics.