No legendary Pokémon can breed (with the exception of Manaphy, but its offspring will be Phione so I guess that doesn't count) but some rarer Pokémon such as Spiritomb and Rotom can breed. However, as they're both genderless, you have to breed them with a Ditto.
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Yes there is rare candy in pearl
breed with a boy and girl or a ditto breed with a boy and girl or a ditto
in the pokecave you have to find the rare pearl
it will be the female Pokemon
yes you can