Hi welcome, for minimum, I'm thinking about 4 would do, but I suggest you update your thread, don't leave the thread with only 4 pokemon for like, idk, a month.
IMO, just state that the pokemon were RNG'd on emulator, I'm not too sure about the community's views regarding them, I guess even if a pokemon is emulator abused, for so long as it has moves that are gen 4 exclusive/ gen 5 tutor exclusive, or it is a legendary from a wondercard (from AR code or not), people would be interested in them.
also please check out this post.
To add to this, when i had my trade thread most of my pokes were bred on an Emerald RNG and no one minded. And you can have as few pokes as you want on a trade thread, but if you want business, the more the better
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