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I dont have 6 iv ones but I do have 5 iv ones in cool balls too and most with egg moves like a moonball gastly with disable bold eevee in luxery ball (for umbreon) with yawn stored power wish and curse and that kind of stuff
I'm guessing gyarados. More specifically, I'll guess the red gyarados from the Gen 2 games.
The red gyarados is only in the gen 2 games, but gyarados is catchable in the first four generations, right? :)
I'll go with Starmie, even tho you need to catch Staryu (which is only Water type) to have Starmie, it could be a tricky question <x<
In case I'm right, my FC is 0147-0570-9943 and my IGN is Lemon Girl