I'm a Pokemon Noob (help)

[Cheebee]

Toddifer said:
So what about times when they only release one game, like Platinum? Are those all different Pokemon as well? Why not a dual release with that too?

Those extra third versions are a bit more different. They always release after the two main games, and are basically sort of a deluxe version of those predecessors, with a bit more fleshed out story, some new features, new and/or different Pokémon, and extra polish.