Man, I was going to say that but would've called it the Combo Ball. Might as well re-use the name, though...Pester Ball -- 1X; with each successive use, Pester Ball's chance to capture a Pokemon increases by 100% (1X, 2X, 4X, 8X, etc.).
So... the Love Ball, but 3x instead of 8x? XD; (I'm assuming you meant gender, since I'm not sure how HP can be opposite.)Attract Ball: has 3x effectiveness if target's HP is the opposite as that of the leading Pokemon.