  For successful electroweak baryogenesis to take place through the sphaleron
process the universe needs to undergo a strong first order cosmological phase
transition. While it does not occur in the Standard Model it becomes possible
in the presence of extra scalars in BSM. One of these scalars can well be
responsible for the recently observed diphoton excess in the CMS and ATLAS
experiments in LHC. We study the Electroweak phase transition in a myriad of
scalar models in this context.
