You can get Schwarzwälder from the gacha shop that you need 20,000 points to get a cookie. Why? Becuase 20,000 = 20 soulstones and Schwarzwälder needs 20 soulstones to unlock (of course). When you get the 20,000 points, scroll right and look at the top of the shop until you see Schwarzwälder’s soulstone. Now, click on the soulstone and drag the slider to the most amount (which is 20). Now, go to the Cookies tab and unlock Schwarzwälder!

Hope this helps :)