uberCuber
Legend
You either have two pieces swapped somewhere else on the cube, or you need to take apart your cube and swap two pieces. That is an impossible case to get.
Or if it's 4x4, r2 U2 r2 Uw2 r2 u2, then U perm.
lol, PLL parity + U perm doesn't swap 2 corners.
@caters, you have a Ga perm. Do a U' from the position you described.