  We present a detailed study of the generation of large primordial
non-Gaussianities during the slow-roll (SR) to ultra-slow roll (USR)
transitions in the framework of Galileon inflation. We found out that due to
having sharp transitions in the USR phase, which persist with a duration of
$\Delta {\it N}_{\rm USR} \sim 2$ e-folds, we are able to generate the
non-Gaussianity amplitude of the order: $|f_{\rm NL}| \sim {\it O}(10^{-2})$ in
the SRI, $-5 < f_{\rm NL} < 5$ in the USR, and $-2 < f_{\rm NL} < 2$ in the
SRII phases. As a result, we are able to achieve a cumulative average value of
$|f_{\rm NL}| \sim {\it O}(1)$. This implies that our results strictly satisfy
Maldacena's no-go theorem in the squeezed limit only for SRI, while they
strictly violate the same condition in both the USR and SRII phases. The
non-renormalization theorem in the Galileon theory helps to support our results
regarding the generation of large mass primordial black holes along with large
non-Gaussianities, which we show to be dependent on the specific positions of
the transition wave numbers fixed at low scales.
