A special bundle with 20 Ultra Balls and 15 Pinap Berries is now available for 1 PokéCoin in Pokémon GO until April 13 at 1 p.m. PDT. In addition, the special code EMRK2EZWLVSSZDC5 can now be used to unlock four Golden Razz Berries, eight Poké Balls and four Silver Pinap Berries. This code can be used by signing in to the official Niantic rewards site by clicking here. As a reminder, be sure to follow Niantic on social media, opt in to receive push notifications, and subscribe to the developer’s emails to stay updated.
Source: Official Pokémon GO blog