Then it's probably fine. It came through WT and I've gotten a significant number of 5IV breedjects from that. Up to you tho!
(Note on Pokerus, there was a hacked strain of it in older gens that would completely disappear off the Pokemon when the day changed over, instead of turning into the inactive kind with the smiley face. You can then infect the Pokemon again with it, but it's annoying and basically means you have to keep the Pokemon in the PC all the time to avoid the Pokerus wearing off. I'd spread it to one Pokemon, then leave it in your party til the time changes over and see if it's still there. If it is then yer good, but if it isn't then you'll have to be careful not to leave it in yer party!)
Well, the Trade Corner is the trade area here. Depending on what you want / have to offer, you can post in the Quick Trade thread (if it's just a few Pokemon), in someone's personal Quick Trades thread (see what they're offering and all that), or in shops. Most of the shops are run by senior members so you're less likely to get hacks, but the Quick Trade threads are more active. You can also make your own Quick Trades thread and offer stuff.
Sure! Not sure if you saw it, but we also have a
Hack Check Guide that Soapyyy (and myself and others) have worked hard to put together that can help you spot suspicious stuff on your own. If you still have doubt tho, of course you can post again! Good luck!