The Hippo of Traumatic Amnesia
...uh.
((Okay, so amnesia has been done... it's even been done by me! More than once but still less than in canon! But never before has traumatic amnesia come in hippo form! THIS IS A HISTORIC EVENT maybe! Aaaaaanyway, if you get too close to the hippo, you forget important things OHNOES. The effects will go away when you get away from the hippo, unless you get BITTEN by the hippo, in which case they'll last until you're bored of milking them.
ETA: ASH IS TOTALLY PLAYING THE HIPPO aaaaaaaand Ash is out for the night!))