Honestly, I don't remember this much. It could be because our copy of 4Ever got ruined, so we threw it out, and never got a new one. But from what I do remember, while it's not my favorite, I recall laughing throughout it. I still wonder why it is Pikachu and his buddies were allowed to wander into a garden and into someone's house (I think it was a mansion). If I remember correctly, they set off either a lawn mower, or a vacuum, and were running from it everywhere while dodging the guard Granbull. I think they ran through a labyrinth.
I find it hilarious how Meowth and Wobbuffet are chimney sweepers in this one. They didn't do much (that I can recall) except get stuck in it at the end until they were blasted out, but just the idea itself is a really silly image.