>>31259278>shiny type:nullbut in all seriousness, you just have to have perseverance and luck, its not that shinies are rare on the gts, their hard to find because they get gobbled up fast.
for those 2 I snagged I missed about 4.
try looking on the pages for version exclusives and commonly bred mons like eevee, also common wild pokes pop up frequently as well
and obviously having a living dex or as close as possible helps immensly