You are unable to breed any legendaries of any kind. That means you can't breed Uxie. You can't even breed the legendaries that have genders: Latios and Latias.
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you have to trade with a diamond or pearl game. you cant trade with platinum because they don't get the egg.
"Is there a Pokemon that has the ability shadow tag in Pokemon diamond?"Yes. The two Pokemon that have the ability shadow tag in ppokemon diamond are wynaut and wobbuffet.
It depends if it has space for two or more Pokemon. I have FireRed but I can't be bothered to check. If so then you can breed by getting a Ditto and another Pokemon or two same Pokemon with opposite genders.
Everything except for legendaries and another ditto. In Pokemon Gold and Silver, you could breed two dittos.
No im afriad not, to breed the two Pokemon must be of the same type and different genders