>>55426947I will between Gyms 2-8 try and use a Pokemon that doesn't evolve. Typically they cannot pull their weight for the Elite 4 except for some obvious exceptions like Lapras, Skarmory, Hawlucha etc.
I love Single stage mons, some are truly amazing. Here is a list of some of my favourites I have used for across the gens:
>Pinsir>Seviper>Kecleon>Sawk & Throh>Druddigon>Carbink>Klefki>Komala>Minior>Togedamaru>FalinksYou have 6 slots, use at least 1 of them to try out a Single stage Pokemon. A lot of the time their movesets are crazy good, and they are lovely little guys.