Silver, I know it has a sprite, but it's not connected to the egg by default. When it appears, when the sprite has a dead link, the game deafults to using the egg sprite. Sorry bout the confusion there.
Water: Yeah, I know about that. I told you, before I hatched it, I hacked the game to see if i can find any pokémon with a dead EGG, CATCH, TRANSFER, and DEX. All of the original pokémon not included have a dead CATCH, that's it. It was very obvious when I found the bugged code, because it had no DEX data link, no EGG data (even pokémon that can't come in an egg have egg data), and obviously, no CATCH or TRANSFER.
Also, that kind of bad egg you referred to -- I'm going to look into that, as far as I know, you're referring to a different egg that is just basically a fault of the GS/AR engine.
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Alright, I'm hacking TRANSFER to let it to let me trade. I'll let you know what happens.