Unchained Alistar

Hey, I'm just wondering, how do you unlock the Unchained {{champion:12}} if you are on a Oceania Server. I know there are certain links to get you the page, but that required you to log in on a NA Server. There is no option for a Oceania Server or at least I haven't found it yet. If you could tell me how to unlock the skin while staying on a Oceania account that would be great. Also if you have not figured out a way or have had no luck, please share this information with the rest of us who may be curious. That would be great.
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