Yesterday, a couple from Ohio Twitch streamed their Articuno capture. They showed the game running on two different phones with both Wi-Fi and data turned on as well as the email that they allegedly received from Niantic about the legendary becoming available on their devices.
A Niantic representative has revealed to Geek.com that some people in the US got Articuno by mistake and that it would be rectified by being removed from their the Legendary from their accounts. You can read that statement below.
“We recently noticed that a few Legendary Pokémon got into a few accounts when they shouldn’t have. To preserve the game’s integrity and as a measure of fairness, we have rectified the situation and revoked the legendary Pokémon from the Trainers’ accounts.”