I have a friend that has a sun team with these pokémon: Ninetales (obviously), Chandelure, Darmanitan, Charizard, Hitmonchan and Shedinja. According to him, Hitmonchan is the spinner, Shedinja is the "shield" (in other words, the defensive pivot of the team), and the rest are the sweepers.
I can't convince him that this team is awful. It's horribly weak to Stealth Rock, Rain, Sandstorm, all of wich can tear apart through it's team. My friend claims to have won many battles with this team, wich I doubt that is true. I spoke to him to take out Shedinja, Hitmonchan and 2 of his Fire-type Pokémon and instead use a better spinner, better Pokémon to serve as a defensive pivot, and at least one Chlorophyll sweeper.
Even after I won against him, it still don't appears to be convinced. How can I convince him that his team just sucks? Especially in this metagame, where rain is dominant.