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.
 * The Battle Frontier returns, and it has these facilities in it: The Battle Hall, Battle Castle, Battle Arcade, Battle Factory, and of course, the Battle Tower.

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.
 * Regigigas is found at the Snowpoint Temple, and instead of it being at level 70, it is found at level 1. That further contributes to the myth that, once it had powerful strength, but it was dormant for a milenium. So, moss has started to grow on it (which is why it has green feet), and it's strengh was crippled. This is also proven by it's ability, Slow Start, that halves its Attack and Speed for five turns.
 * Shaymin now has a new change, Sky Forme. If you show a Shaymin to a woman in Floroma town (It doesn't have to be from the game itself, it can be an event), she'll give you the Gracidea. Shaymin gains a new apperance, new base stats, the ability Serene Grace, and it becomes a Grass/Flying type. It is a key item, so you won't lose it. Shaymin reverts back to Land forme when it's night, or when it gets frozen status.