This event lines up well with an adjustment to the game's 7-Day Streak mechanic, promising an evolution item drop every time you complete a streak instead of just a random chance. The event lasts exactly seven days, which means if you are an active player every day until the 29th you'll not only have an arsenal of new water-type creatures to battle with but you'll also have a decent chance of evolving one into something even better.
Now get out there and catch yourself a Lapras. You deserve it.
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