Happened to me once. I traded a male Ralts with Trace then a few days laters received the same Ralts. Coudn't give him away now since I know it surely travel the world.
For my part I always send nice pokemon, but recive mostly junk. But I have to admit I received a 5-6IV laversta once.
X Competitive Team (VGC Style): Commander Sheepard the Ampharos, Coco Chanel the Aromatisse, Me the Slowbro, Father the Marowak, Lobstar the Crawdaunt, Funkgi the Amoongus.
ORAS Special 10th Anniversary Shiny Team Project: Yusei the Blaziken, Postal the Swellow, Myazaki the Milotic, Maroon the Breloom, Christmas the Female Gardevoir, Arrow the Linoone
In game name: Maeve
FC Code: 0146-8714-8650
Safari Type: Fighting (Pancham, Mankey, Tyrogue)
I love Nicknames!