Alright, there`s a lot of new features Platinum has that Diamond and Pearl don`t have,
right I have decided to name them all for people.;D If I find any more new features, I
will add them to the comments.If there is something you haven`t seen listed here, please
post it on the comments!

Cities & towns, & routes

Sinnoh has had a makeover, everyone! Sinnoh has gotten colder, and there is snow in places
throughout Sinnoh.In edition, the character you play wears warmer clothes.Not to forget
that Floroama Town has a sign at the beginning of the town, and all routes, cities, and
towns have all been changed, at least a little bit.

Game Play!

So, there is a new plot.This time, Team Galactic is going after Giratina.He needs Dialga
& Palkia to complete this.The hero gets to catch all three of the legends, not just
Dialga/Palkia.Shaymin can now be caught in both Land Forme, & Sky Forme without
hacking.Use an item to change her forme to sky, if she`s in Land Forme.Also, there is
another world where you catch Giratina.I only know its Japanese name, Torn World, but if I
remember the English name I will add it onto the comments! And NEVER EVER forget this
awesome feature; the Pokemon are in different stances when you look at them! And if they
aren`t, then their movement at least changes.My favorite is Luxray now!

Wifi Features

Introducing the brand-new Wifi Plaza! You can meet there in one of four different rooms;
Fire Room, Water Room, Grass Room, and Electric Room.Meet players from around the world
and get to talk to them and play games with them; Mime Jr.Top, Swalot Pop, and Wobuffet
Pop! But that`s not the ending to it; not even close! When you enter the Wifi Plaza, you
get to choose which type of Pokemon you like the most.You also get a Tap Toy, and it is
powered up when you win a game against people.The Tap Toy starts at one, and can be
upgraded all the way to three.You can also ask other players to share their Tap Toy with
you.When the Wifi Plaza closes, catch a ride on the parade boats!

And that is all I have thought of when I typed this, hope it helped, at least a little
bit.Good luck on your journey through Sinnoh! 

---Ariana