Board Thread:Plants vs. Zombies 2: It's About Time/@comment-25027488-20150515033212/@comment-24203813-20150515033911

Well, they can't be obtained normally. They're premium, and have to be bought for real money. It actually costs yen, and the US dollar equivalent of the cost for them is 10$. So, I can't give you steps on how to unlock them, but if you have yen, you can get them.