I have finally got round to creating a pokedex of sorts for all of the new pokemon in Diamond and Pearl. It is more of a list than a proper dex though, and it might be slightly confusing. These are ALL the new pokemon, even the non-dex legendaries and the new evolutions.
http://www.pokemonelite2000.com/sprites.html
Turtwig
387 
Grass
Grotle
388 
Grass
Torterra
389 
Grass / Ground
Chimchar
390 
Fire
Monferno
391 
Fire / Fighting
Infernape
392 
Fire / Fighting
Piplup
393 
Water
Prinplup
394 
Water
Empoleon
395 
Water / Steel
Starly
396 
Normal / Flying
Staravia
397 
Normal / Flying
Staraptor
398 
Normal / Flying
Bidoof
399 
Normal
Bibarel
400 
Normal / Water
Kricketot
401 
Bug
Kricketune
402 
Bug
Shinx
403 
Electric
Luxio
404 
Electric
Luxray
405 
Electric
Budew
406 
Grass / Poison
Roserade
407 
Grass / Poison
Cranidos
408 
Rock
Rampardos
409 
Rock
Shieldon
410 
Rock / Steel
Bastiodon
411 
Rock / Steel
Burmy
412 
Bug
Wormadam
413 
Bug / Grass
Mothim
414 
Bug / Flying
Combee
415 
Bug / Flying
Vespiqueen
416 
Bug / Flying
Pachirisu
417 
Electric
Buizel
418 
Water
Floatzel
419 
Water
Cherubi
420 
Grass
Cherrim
421 
Grass
Shellos
422 
Water
Gastrodon
423 
Water / Ground
Ambipom
424 
Normal
Drifloon
425 
Ghost / Flying
Drifblim
426 
Ghost / Flying
Buneary
427 
Normal
Lopunny
428 
Normal
Mismagius
429 
Ghost
Honchkrow
430 
Dark / Flying
Glameow
431 
Normal
Purugly
432 
Normal
Chingling
433 
Psychic
Stunky
434 
Poison / Dark
Skuntank
435 
Poison / Dark
Bronzor
436 
Steel / Psychic
Bronzong
437 
Steel / Psychic
Bonsly
438 
Rock
Mime Jr.
439 
Psychic
Happiny
440 
Normal
Chatot
441 
Normal / Flying
Spiritomb
442 
Ghost / Dark
Gible
443 
Dragon / Ground
Gabite
444 
Dragon / Ground
Garchomp
445 
Dragon / Ground
Munchlax
446 
Normal
Riolu
447 
Fighting
Lucario
448 
Fighting / Steel
Hippopotas
449 
Ground
Hippowdon
450 
Ground
Skorupi
451 
Poison / Bug
Drapion
452 
Poison / Dark
Croagunk
453 
Poison / Fighting
Toxicroak
454 
Poison / Fighting
Carnivine
455 
Grass
Finneon
456 
Water
Lumineon
457 
Water
Mantyke
458 
Water / Flying
Snover
459 
Grass / Ice
Abomasnow
460
Grass / Ice
Weavile
461 
Dark / Ice
Magnezone
462 
Electric / Steel
Lickilicky
463 
Normal
Rhyperior
464 
Ground / Rock
Tangrowth
465 
Grass
Electivire
466 
Electric
Magmortar
467 
Fire
Togekiss
468 
Normal / Flying
Yanmega
469 
Bug / Flying
Leafeon
470 
Grass
Glaceon
471 
Ice
Gliscor
472 
Ground / Flying
Mamoswine
473 
Ice / Ground
PorygonZ
474 
Normal
Gallade
475 
Psychic / Fighting
Probopass
476 
Rock / Steel
Dusknoir
477 
Ghost
Froslass
478 
Ice / Ghost
Rotom
479 
Electric / Ghost
Uxie
480 
Psychic
Mesprit
481 
Psychic
Azelf
482 
Psychic
Dialga
483 
Steel / Dragon
Palkia
484 
Water / Dragon
Heatran
485 
Fire / Steel
Regigigas
486 
Normal
Giratina
487 
Ghost / Dragon
Cresselia
488 
Psychic
Phione
489 
Water
Manaphy
490 
Water
Darkrai
491 
Dark
Shaymin
492 
Grass
Arceus
493 
Normal