well, first off, you cant get dialga without trading from diamond, you also cant get keckleon with the poke radar, *silcoon, *beautifly, stunky, skuntank, mime Jr or Mr mime (with the exception of mr backlot's garden)
*only if you evolve wurmple with a low nature value
you cant get a diamond on Pokemon pearl but you can get a pearl on diammond ...and pearl.
HelloSorry to say but you cant trade Pokemon from pearl to leafgreen but you can migrate Pokemon from leafgreen to pearl via the pal park
you cant be a Pokemon in pearl you are a person NO u can on hacked roms
you cant
No you cant
you cant
NO you cant catch syther in Pokemon pearl
No I cant
You Cant
you cant
Cant get one on pearl or diamond.
you cant you have to trade them to your Pokemon pearl from other games