  In this paper, we prove that the $3$-sphere endowed with an arbitrary
Riemannian metric either contains at least two embedded minimal $2$-spheres or
admits an optimal foliation by $2$-spheres. This generalizes recent results by
Haslhofer-Ketover (Duke Math. J. 2019), where the existence of optimal
foliations and minimal $2$-spheres has been established under the additional
assumption that the metric is generic. In light of recent examples by
Wang-Zhou, where min-max for some non-bumpy metrics on the 3-sphere produces
higher multiplicities, our results are in a certain sense sharp.
