Powers: It can make rain and, if it interacts with Wood, the two can grow a forest
Captured in: Episode3: Sakura's Tiring Sunday
How it was captured: Sakura found Rain as a card while cleaning the house. However, she left it unattended with Wood, and the two created a huge forest right inside her house! When rain attacked, she used Watery to counteract Rain's water, and sent it back against it. While Rain was trapped in a bubble of water, Sakura sealed it away.