Smyths toy store are giving away codes for the Legendary birds, Articuno, Zapdos and Moltres until the 11th April. Each one has their hidden abilities- Snow Cloak, Static and Flame Body respectively. On one game you can redeem all three- but not more than one of each. Smyths are giving away 4 per household, and the codes you get are random.
It is rumoured that the fourth digit of the code lets you know which bird you receive- 6 for Articuno, 7 for Zapdos, 8 for Moltres.