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Using a data sample of 980~fb$^{-1}$ collected with the Belle detectoroperating at the KEKB asymmetric-energy $e^+e^-$ collider, we present evidencefor the $\Omega(2012)^-$ in the resonant substructure of $\Omega_{c}^{0} \to\pi^+ (\bar{K}\Xi)^{-}$ ($(\bar{K}\Xi)^{-}$ = $K^-\Xi^0$ + $\bar{K}^0 \Xi^-$)decays. The significance of the $\Omega(2012)^-$ signal is 4.2$\sigma$ afterconsidering the systematic uncertainties. The ratio of the branching fractionof $\Omega_{c}^{0} \to \pi^{+} \Omega(2012)^- \to \pi^+ (\bar{K}\Xi)^{-}$relative to that of $\Omega_{c}^{0} \to \pi^{+} \Omega^-$ is calculated to be0.220 $\pm$ 0.059(stat.) $\pm$ 0.035(syst.). The individual ratios of thebranching fractions of the two isospin modes are also determined, and found tobe ${\cal B}(\Omega_{c}^0 \to \pi^+ \Omega(2012)^-) \times {\calB}(\Omega(2012)^- \to K^-\Xi^0)/{\cal B}(\Omega_{c}^0 \to \pi^+ K^- \Xi^0)$ =(9.6 $\pm$ 3.2(stat.) $\pm$ 1.8(syst.))\% and ${\cal B}(\Omega_{c}^0 \to \pi^+\Omega(2012)^-) \times {\cal B}(\Omega(2012)^- \to \bar{K}^0 \Xi^-)/{\calB}(\Omega_{c}^0 \to \pi^+ \bar{K}^0 \Xi^-)$ = (5.5 $\pm$ 2.8(stat.) $\pm$0.7(syst.))\%.

Evidence for the decay $\Omega_{c}^{0} \to \pi^+\Omega(2012)^- \to \pi^+ (\bar{K}\Xi)^{-}$