I use GTS negotiations because I find it thrilling to trade with people from Japan and everywhere else where I will never visit. I think it's cool getting a Japanese pokemon because you can use it while doing MM to increase the chances of a shiny. The best I have ever gotten was a Flygon for a shiny Weavile. I don't even remember where I got the Trapinch I evolved it from, probably another trade. But I think it's fun.
Breeding for a shiny Poliwag. I have tons of not shiny Poliwags. PM if you would like a specific gender, ability, nature, moves, etc.
I am giving away Riolu's, Skitty's, Sneasel's, Oshawott's, Zorua's, and Poliwag's. PM if you would like one!