Let's have some fun and play a childhood imagination game...
You're now a gym leader in a totally new region! You're going to be running your very own gym to take on all kinds of aspiring Pokemon trainers, but first you need to decide on a team!
>Gym type theme
>Five Pokemon, specify which one is your "signature" Pokemon with an asterisk
>Badge name

Some basic rules:
>Pokemon on your team must follow the type theme you chose, and dual-types are allowed so long as one type matches the theme; however, one Pokemon on your team may be allowed to stray from the type theme entirely (ex: one ghost type among a fighting team)
>No legendaries, pseudo-legendaries, ultras, etc; one starter Pokemon may be allowed if you so choose, otherwise your team should consist of common Pokemon
>Assume that there are no mega-evolutions, Alola forms, etc. in this new region
>Assume that you are the final gym leader; you will be using all five of your Pokemon and may choose third-stage evolutions if desired

And remember to have fun!