Pokémon Platinum/New features

Major changes

 * The Sinnoh Pokédex has 60 new Pokémon added to it. As such, there will be more trainers and more Pokémon for you to raise.
 * 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.
 * There is a Battle Frontier, and it has these facilities in it: The Battle Hall, Battle Castle, Battle Arcade, Battle Factory, and of course, the Battle Tower.
 * You can have rematches with all of the Gym Leaders and can also battle against the five trainers that helped you at various points in the game.

Legendary Pokémon 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 millennium. So, moss has started to grow on it (which is why it has green feet), and its strength was crippled. This is also proven by its 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 appearance, 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 form when it's night, or when it gets frozen status.

Gym Leader rematches
Unlike in Diamond and Pearl, you can battle the Gym Leaders as many times as you like in a place called the Battleground which is found in the Survival Area beside the Pokemon Centre.

Pokemon
(level 62) (level 61) (level 61) (level 63) ((Level 65)

Pokemon
(level 61) (level 62) (level 61) (level 63) (level 65)

Pokemon
(level 61) (Level 61) (level 62) (level 63) (level 65)

Pokemon
(level 62) (level 64) (level 62) (level 63) (level 66)

Pokemon
(level 61) (level 62) (level 61) (level 63) {level 65)

Pokemon
(level 61) (level 63) (level 62) (level 61) (level 65)

Pokemon
(level 62) (level 61) (level 61) (level 63) (level 65)

Pokemon
(level 61) (level 61) (level 63) (level 62) (level 65)

Stat trainers
Stat trainers are five trainers that you meet at various points in the game who will later challenge you in the Battleground. Each specialises in a specific stat. Although there is not really a trainer who specialises in Special Defence, most of Buck's Pokemon have strong Special Defence so arguably he could be seen as a trainer who specialises in two stats.

Signature stat
Attack

Pokemon
(level 61) (level 61) (level 63) (level 62) (level 65)

Signature stat
HP

Pokemon
(level 61) (level 62) (level 61) (level 63) (level 65)

Signature stat
Defence

Special Defence

Pokemon
(level 61) (level 63) (level 61) (level 62) (level 65)

Signature stat
Special Attack

Pokemon
(level 61) (level 62) (level 61) (level 63) (level 65)

Signature stat
Speed

Pokemon
(level 61) (level 63) (level 61) (level 62) (level 65)