Following the previous Generation's example, Generation IV provided us with none other than Pokémon Heart Gold and Soul Silver. While relatively tracing the original's plot and mechanics, it introduced a new mechanic only ever seen in Pokémon Yellow; Pokémon following behind you. However, unlike in Pokémon Yellow where only your Pikachu follows you, any Pokémon can follow you. There was also the Pokewalker accessory to get new Pokémon and encourage people to walk around.
What did you think about these games? Did you like them more than the originals? How did you feel about Pokémon following behind you? And what about the Pokewalker? Am I the only one who ever used that little device?