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I'm not going to do USUM teams for them since USUM was a mistake in more ways than one. As for their teams here, I wanted to emphasize a few things with the characters through the Pokemon they use. Firstly is that no one is an outright Type specialist anymore, it doesn't make sense that they would be and I think it was laziness on Game Freak's part when they did that.
You may note that Faba does not use any Alolan Pokemon on his team and the only Gen 7 Pokemon Lusamine uses is one that's not from Alola, I did this as a subtle nod to how more malevolent they are than the other villains and as a sort of disdain they'd have towards the Alolan Region.
Guzma has a Ribombee specifically in his last battle because that is the turning point from him as an antagonist to a more neutral character and I think having a more cutesy Bug-Type for him would show that change.
Gladion's team is notably devoid of Dark-Types due to what his character really is and Passimian I think helps show his eventual willingness to help the player.
Lusamine's team I tried to make represent several things, first off Pangoro instead of Bewear because I think Bewear would make sense for USUM Lusmaine not SM Lusamine. Secondly, Kantonian Ninetales is an explicit rejection of the Alolan lifestyle, Froslass is a much less playful Ghost-Type and somewhat ambiguous morally in its depictions so I think it works well as a contrast to Gladion's Gengar. Wailord is simply a representation of the nature of travel that the Aether Foundation conducts and also because I didn't want to use Sharpedo. Nihilego is self-explanatory and Dragonite works as the powerhouse in that it's unassuming like Bewear but is incredibly dangerous.