This. I've gotten quite a few Master Balls and other helpful items thanks to the GTS. I was able to score a Power Bracer through a Sawk trade, which really helped my shiny Golett Masuda run.I use the GTS, both the regular one and GTS negotiations. Some people will offer doable trades and their offered Pokémon will be holding a Master Ball. I've gotten more than one that way. I also use the GTS in an attempt to retrieve a Chandelure I traded away many months ago, purely by accident.
I've done this as well. It blows my mind what people will toss onto the GTS and how I can make out like a bandit. I've gotten some wonderful little Goletts, some absolutely perfect, via the GTS. The trainers in question wanted Legendaries and got them, but the Legendaries I've sent off were of lower quality, stat wise.And I like to think of the GTS as a garbage dump in an extremely rich neighborhood. Sure, you gotta dig through a few layers of crap, but sooner or later, you're gonna uncover a real gem. I once traded a DW Eevee for what seemed to be an ordinary Japanese Zorua. The Zorua turned out to have a Naive nature, Special Attack and Speed IVs of 31, and four of its Egg moves, including Extrasensory and Dark Pulse. And then there was the Dream World Porygon with a Modest nature and 31 IVs across the board. Cost me a Latios. I don't know what compelled me to take that chance, but damn it, I'm glad I did.
They can. Believe me, they can. I'm dead sick of seeing a Golurk being "offered" for a level 9 and under Legendary. But if you keep looking, you can find something doable. You just have to be very persistent. It's how I've gotten my hands on so many shinies via the GTS.No. People put up shit offers.