Which molecular geometry are most likely to result, from an octahedral electron geometry?

Because of the ${\mathrm{sp}}^3{\mathrm{d}}^2$ electron geometry of the octahedron. Lone pairs of electrons are located on either side of the centre atom in the two orbitals of this structure. A molecule with a square planar structure is created by the remaining four atoms that are attached to the core atom.
On the other hand, a square pyramid-shaped molecule results from connecting the remaining five atoms to the core atom and a single pair of electrons in one orbital.