Aether create Type: null, Lusamine and his corporation are the are 51 of pokémon world and they want capture the Ultra beast and investigated him. They are the real villians, the null function is fight with Solgaleo/lunala (depending the versión of the game) and catch it, for used them to capture the ultra beast. Team skull are real animalist anarquist association, and gladio is the Young brother of Lusamine, he know the Eather plans and scape with Type:Null and joins Team skull to stop his sister. Lilie is UB-01, she become of a another world, like a dream of N, pokémon and humans live in armony, this is the reason for why she hate the pokémon battle. She take that form (like Lusamine) to contact with Gladio and Guzma, but they have ways to stop Eather. Then she contact with the avatar (you) and guide you to stop the Aether plans. Guzma and Kakui was friend in the childhood, and they want stop Aether, but they think too diferent and the cant work together, an thats is why Lillie is work with Kakui.