My 2 cents is this
Since the removed of VD the trading between actual Shiny for Shiny deals are nearly non existence to what they were before because everyone is shit scared and trading for "Cash" is much safer, but that has also lead the price on some shinies to plummet, mainly because 1. they have no idea of value 2. theres not alot of yen around so to sell they have to sell for a stupidly cheap price
My opinion is that "Trading" still exists but "Shiny Trading" is on its back IMO