[REQUEST] Need help designing a monotype team

[ImAWizrd]

Hi! So I'm going to be entering a local tournament in which we've all been assigned monotypes by RNG.

My typing is Psychic so I'm looking to build a 3v3 singles team revolving around psychic types. My intial thoughts lead me to Mega slowbro as the obvious choice, since its only major weakness is dark types. Alternatively I could run Slowbro and use mega-Medicham instead, since the fighting type covers the obvious dark weakness, whilst also having much better offensive type coverage vs other monoteams.

I am looking for any suggestions, either for an entirely new team or for teams that have been built with the current two possibilities in mind.

Thanks for your time!