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Official WiFi servers for the DS were shut down years ago, but it's supposedly still possible to trade with people in Gens 4 and 5. I don't really know how it works myself, but there is this 2.5 year old thread on here that says some stuff about it.
Ah that takes me back. There are, or at least used to be, a bunch of tutorials on how to set up your DNS for mystery gift on black and white (And B2W2). The thing is, I couldn't do it on platinum because I didn't have a WEP router.
EDIT: So I found a thing where you set up a hotspot on linux, I'll see if it works and then write a tutorial if it does!
Essentially, a ghost image is a smaller version of the original photo image on an old ironsides fake id and is generally printed semi-translucent. These ghost images are made possible by using a software that will allow for the ghost image to be added to the plastic card during the printing process.