Hmm, that is a lot of questions. First off, there are lots of useful info for checking if your traded 'mon is hacked in the first post of
Trade Corner's Official Hack Report thread.
Trade Corner in general is a good section for stuff related to trading. For further questions like this I suggest VM/PMing a staff member or a helpful user, or if you wish to ask stuff about the forum and be answered / redirected to another part of the forum, then there's a
Quick Questions & Answers thread, so as to keep this thread centered on welcoming you to the forum. :3 As for those duplicate candies (which I assume you mean when you mentioned them), I'm no trading expert, so I'm not entirely sure if they count as hacked either. However, for 'mons who have eaten these duplicated sweets, I doubt that they count as hacked, but I don't know. Maybe you can ask a more knowledgeable trading person?
Welcome to PC, Deadpool! So your favorite types are Ghost, Dragon, Fire and Dark eh? Those are some pretty edgy types. I like Water-types the most, but the types that you picked are also pretty cool, I think! I'm glad to hear that you're playing the previous generations after B/W and B2/W2. I'm sure you're gonna beat Platinum soon enough, too. Trading in particular is an interesting aspect of the franchise that it has its own section here at PC (the Trade Corner, which I linked above, haha)!
I hope you eventually get Emerald because we almost have the same list of main series games played, with Blue from around the same time being the first. :D I can't wait for X and Y, too! By the way, we have a
forum for X and Y which can help you stave off the waiting jitters, so be sure to check that out~ And if you need help, feel free to message me or
Cirno for new users-related help, as well as the other bold username'd mods for their own sections! We'll try to get to you as soon as we can so that you enjoy your experience and not have problems. Just read the rules, stay active, kick back and relax. So yeah, I'm gonna end this with that. :p Bye for now!