Right now, there are 395 Pokemon. You can only catch 386 currently, but here are some from Diamond and Pearl:
Bonsly, Sudowoodo's pre evolution. Rock type.
Manyula, Sneasel's evolution. Ice/Dark type.
Munchlax, Snorlax's pre evolution. Normal type.
Manene, Mr. Mime's pre evolution. Psychic type.
Rukario, new legendary. Star of 8th movie. Steel/Fighting type.
Tamanta, Mantine pre-evolution. In 9th movie. Probably Water/Flying type.
Perappu, a brand new Pokemon. Resembles a macaw. Probably Normal/Flying type.
Buizeru, another new Pokemon. Sorta looks like an otter. It could be heaps of types...
Manaphy, a new legendary Pokemon. Stars in 9th movie. Probably Water type. (-_-')
I agree, the original 151 were good... but, there are exceptions to this rule. I like many of the Johto and Hoenn Pokemon, and hate some of the Kanto *coughOddishcough*.