I mean you should try to think of a Pokémon you like to start with and go from there, do a little research on their abilities and descriptions and try to come up with a premise.
I'll drop this one I made up just now but maybe a side scene for gen 5 could be running into a Throh and Sawk in a fight. They're counterparts to one another and you are given the choice to help one win the fight, judo vs karate or probably in the MCs mind BBW vs Fit (I know which one chainsaw would choose ;)). You then fuck the winner using the cock of the loser. Again chainsaw isn't made of side scenes but hey its a fun idea and fighting types aren't really represented much so far.