Going to have a friendly Sun and Moon tournament with some people.

There is any cheap but effective tactic that I can use even with my shitty captured pokemons?

I don't expect to win since some of them are into the competitive thing and talk about perfect ivs and such, but some are clueless faggots like me, and I would like to win those at least.

I'm open to any formation (as long as doesn't include legendary mons) and tactic no matter how cheap is it as long as is effective and could take some people by surprise.