I've done quite a few lucky trades with my son. Nothing amazing yet, but they definitely boosted the rate. About one in ten trades, by the look of it. Lots of potential shinies. He needs a blue Ponyta and I'm still hunting for shiny Poochyena. Seems to be heaps of Growlithe around too, even when not weather boosted. Keen to catch and reroll as many Torchic as possible to get a nice lucky for the inevitable Community Day special move.