You cannot catch bulbasaur in diamond and pearl.
If you have firered or leafgreen can set 6 Pokemon free in pal park and catch them there.
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get firered or leafgreen and migrate it to pearl after national pokedex
You can't, Bulbasaur is unobtainable. You have to trade, hack, cheat or get it from mystery gift.
Not that im sure of though, but in the Battle Tower there is.
To get it legitimately you need Pokémon Leaf-green. Choose Bulbasaur beat the Elite four and catch it in Random Grass Patches. Then transfer it into the pal park in Pokémon pearl.
you need bulbasaur or one of the evolutions and a ditto or again a bulbasaur or evolution of the opposite sex