I was trading Scatterbugs for ages trying to get them all, with the hardest being the Monsoon forme, which was the last one I needed. I spent months looking for just it and getting nothing. I eventually gave up for awhile, leaving three Scatterbugs unevolved in the PC. A month or so later, I decided to look through all the legends I had caught, and select a few that I would trade for the Monsoon forme. I ultimately did trade the Lugia I caught in Alpha Sapphire, finally completing my collection. I then decided that I'd evolve those last three Scatterbug in the PC before I officially declare my search over, and...one of them ended up being Monsoon forme too. xDDD
So now I have two. ^_^