I see that you are asking kindly, but I don't think people are going to give you these legendaries. Volcanion is very expensive and I know people won't wanna just give it away. And people probably won't give you the other pokes. Mewtwo, Arceus and Dialga are all rare pokemon that can be found on the map. People waste their time to find them. They wouldn't give it to you easily. You need to find them yourself if you really want them. Except for volcanion, he cna'tbe found on the maps anymore because he was an event a few years ago.