Group X cant breed at all, even with ditto?

Question

I was on serebii, and though the people on this site told me Metagross could breed with ditto, serebii said it couldnt being in group x. So who is right?

P.S. The link is(to the serebii page I was looking at) http://www.serebii.net/pokemon_advance/egg-group.shtml

Answer 1

It can breed, but only with ditto. only legendaries (except manaphy) and baby pokemon are unable to breed.

Comments

All right then, there should be a group: Ditto and it shouldhave everything except legendaries though, I was confused.

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THe confusing thing is that even though these pokemon can breed, none of them have egg moves.

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Nor do some other Pokemon.