  Using a multiscale computational approach, we probe the origin and evolution
of ultraflatbands in moir\'e superlattices of twisted bilayer MoS$_2$, a
prototypical transition metal dichalcogenide. Unlike twisted bilayer graphene,
we find no unique magic angles in twisted bilayer MoS$_2$ for flatband
formation. Ultraflatbands form at the valence band edge for twist angles
($\theta$) close to 0$^\circ$ and at both the valence and conduction band edges
for $\theta$ close to 60$^\circ$, and have distinct origins. For$ \theta$ close
to 0$^\circ$, inhomogeneous hybridization in the reconstructed moir\'e
superlattice is sufficient to explain the formation of flatbands. For $\theta$
close to 60$^\circ$, additionally, local strains cause the formation of
modulating triangular potential wells such that electrons and holes are
spatially separated. This leads to multiple energy-separated ultraflatbands at
the band edges closely resembling eigenfunctions of a quantum particle in an
equilateral triangle well. Twisted bilayer transition metal dichalcogenides are
thus suitable candidates for the realisation of ordered quantum dot array.
