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Say I went to the next Pokemon Movie, hoping to get Arceus. How do I get the Pokemon when I go there? Do I need to bring my DS, so they can input the data, or what?
You'll only be able to get it if you're going to a cinema in Japan, y'know. But if you are, you'll probably have to bring your DS to transfer over the flute to it.
You need to bring your DS along with you when you go into the Japanese cinema. See https://bulbapedia.bulbagarden.net/wiki/Event.
I'm not sure if it will work on a non-Japanese game version if you're thinking of bringing it to the Japanese theater.
Many Japanese wondercards are compatible with English D/P. However, a few recent ones have been Plat exclusive.
It's likely that the Movie 12 event will just be Arceus distribustion. If Azure Flute is to be distributed, it'll likely be wireless rather than an event, similar to how Darkrai's item is being distributed now.