Pokémon Platinum/New features

Major changes

 * The Sinnoh Pokédex has 60 new Pokémon added to it. As such, there will be more trainers and better Pokémon for you to raise. Some of them include, , etc.
 * The Elite Four team lineups have changed to accommodate the new Pokédex, and will level up upon obtaining the National Pokédex.
 * There are two new Characters in the story. Charon, a scientist for Team Galactic, and Looker, an investigator for the International Police.
 * There is a new Wifi Plaza for anyone who wants to play mini games with other players. There is a time limit, however.
 * There is a new area called the Distortion World that plays a part in the story. It is also where you find Giratina at lv. 47.

Legendary Pokemon Changes

 * Palkia and Dialga are caught after beating the Elite Four. You have to talk to Cynthia's grandmother and find the Adamant and Lustrious orbs in Mt. Coronet. They are at lv. 70 and easier to catch.
 * Giratina is found in the Distortion world at lv. 47.