6iv dittos are all hacked/generated. That could be a problem because you don't know exactly if the 3ds and cartridge region is okay for masuda. I suggest you to use a parent obtained through GtS, maybe from the same egg group of your tynamo. Just an advice... I'm doing that and have hatched two shinies in 500 eggs.
That's not the case with my ditto, before obtaining the shiny charm with it I hatched a misdreavus in 18 eggs and a trubbish in 162. Just having a streak of bad luck I guess. As long as the ditto has the tag it's good.