The way you get these Pokémon are by transferring them or one of their evo chain to Diamond & Pearl using Pal Park and capturing them in there, Breeding if necessary to get the lower forms.
These are the only Pokémon that you need to transfer using this method in order to complete the National Dex. All others are obtainable in the game.
Below is a list of all the Pokémon that are not Wild or Obtainable in Diamond & Pearl by themselves:
Unobtainable Pokémon
Nat No. | Pic | Name | Type 1 | Type 2 |
#001 | Bulbasaur | |||
#002 | Ivysaur | |||
#003 | Venusaur | |||
#004 | Charmander | |||
#005 | Charmeleon | |||
#006 | Charizard | |||
#007 | Squirtle | |||
#008 | Wartortle | |||
#009 | Blastoise | |||
#114 | Tangela | |||
#144 | Articuno | |||
#145 | Zapdos | |||
#146 | Moltres | |||
#150 | Mewtwo | |||
#151 | Mew | |||
#152 | Chikorita | |||
#153 | Bayleef | |||
#154 | Meganium | |||
#155 | Cyndaquil | |||
#156 | Quilava | |||
#157 | Typhlosion | |||
#158 | Totodile | |||
#159 | Croconaw | |||
#160 | Feraligatr | |||
#243 | Raikou | |||
#244 | Entei | |||
#245 | Suicune | |||
#249 | Lugia | |||
#250 | Ho-oh | |||
#251 | Celebi | |||
#252 | Treecko | |||
#253 | Grovyle | |||
#254 | Sceptile | |||
#255 | Torchic | |||
#256 | Combusken | |||
#257 | Blaziken | |||
#258 | Mudkip | |||
#259 | Marshtomp | |||
#260 | Swampert | |||
#357 | Tropius | |||
#377 | Regirock | |||
#378 | Regice | |||
#379 | Registeel | |||
#380 | Latias | |||
#381 | Latios | |||
#382 | Kyogre | |||
#383 | Groudon | |||
#384 | Rayquaza | |||
#385 | Jirachi | |||
#386 | Deoxys |