I think this is one of the better shorts. The others after this just weren't that great (except maybe "Gotta Dance!"), they were all just too cutesy. Don't get me wrong, I don't mind cutesy stuff, but it's at least got to have a point.
Anyway, I like the Pichu Brothers, they remind me of my twin brothers. You can tell one's smart and a leader, and the other's mischievous and kinda dumb. And I have to admit, I'm a sucker for cute things that has tufts of hair sticking up. You almost never get to see that in the anime.
It also was a nice way to show a lot of Johto Pokémon, especially the babies. I think I saw the baby Pokémon here first before they were in the series--if at all. And I liked how they had a playground in an alleyway, that's rather... weird XD. The Houndour was there just to be a bully and to have things be dropped on its head.
But it also had proof that time DOES go by on Pokémon, as it marked the first year anniversary of *gasp* Ash and Pikachu. So as of Pikachu and Pichu, Ash was eleven. I think we haven't seen an anniversary party since.
I wish we had the movie so I could see this more often, but I do remember a lot of it, which I suppose is a sign that the short was good enough to remain in my memory for as long as it has. Then again, who can forget the Pichu Brothers?