That's not legit, that's legal
Anyway, I'm not up for explaining how to create a legal Pokemon right now, (I really need to sleep!), but since it's for in-game play, http://www.pokecheck.org/ has plenty of bred Pokemon. You can check the legality analysis if you like. Just download the file, and since you know about Pokesav, I presume you know how to load them into the sav too.
Though, if you take a poke around the forums, you'll probably find explanations on your question.
edit: have you seen this?
http://projectpokemon.org/forums/showthread.php?825-Pok%E9mon-Legality-Guide
Not sure about this one, but Greencat's should be good.
http://www.gamefaqs.com/boards/946308-pokemon-platinum-version/50916426
I'd think some values will be different for HGSS, but I'm sure it can't be that hard to figure out.