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>Type:Null is a chimera created by Aether from the Pokemon they "save". Gladian takes it with him to join Team Skull, who is made to look much worse in the public eye than they actually are. By "enforcing" the grunts to do really terrible stuff, he's able to "save" more Pokemon while Guzma and Plumeria are vindicated more. In reality, Guzma and Plumeria care deeply for the grunts, and only started Team Skull to lash out against the Island trials. They wind up joining you to stop Gladian and Aether, and in turn Guzma is allowed to be a trial captain
>UB-01 is not a real Pokemon (notice no type or ability shown in its reveal), rather it's one of the many extraterrestrial beings Aether has been using to further their sick experiments. Lillie left for the opposite reason Gladian did, since UB-01 and her bonded enough for it to take on her appearance out of love. She escapes with it in her bag, and detests Pokemon Battles since they bring harm to Pokemon.
>Colress returns, explaining that the original dragon was actually an incredibly powerful ultra beast, and that through DNA splicing they can merge together the true dragon again