yes there is some new Pokemon on plantinum. like girantina
shaymin sky from that's it
yes there is a new Pokemon in Pokemon platinum. its name is Arcues.
yes there is It Still has the SAME sinnoh dex but a LOT of changes in the story Shaymin Sky Form Gracidea flower which is obtainable if you have shaymin in the 1st box in your party & if you talk...
There are no new pokemon, it's still 4th generation pokedex