I beat the whole ruins of Alph "mystery" and I didn't discover a secret.
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493 different ones, but for all in total... Unknown.
you go down to the house next to the Pokemon center and inside is this guy, talk to him and he will give a secret potion.
Go to Cianwood City,talk to the guy in the pharmacy(not pokemart) and he will give you it.
no you can trade soulsilver pokemon to black
Primo is in Violet City Pokemon Center, next to the PC. For additional info on Primo and his purpose in SoulSilver in regards to the Secret Codes, please see the Related Link below.