"Round and wobbly, pink and jolly, a Rashberry is an animal that hasn't realized just how tasty it looks. When it's scared, it makes a cool squealing noise, which only encourages cruel people."
Eating a Nightshade Berry changes their color to violet
Eating a Poppy seed changes their color to red
Eating a Watercress seed changes their color to green
Benefits
Feeding a piece of cheese cake to a Rashberry will turn them into a Hogurt
Species Conflicts
Rashberries will start fights with a Pigxie if one is nearby
Other Info
You can get a Pigxie by cross romancing a Rashberry with a Swanana. Just buy a Mystery House from Willy Builder, meet the Romance requirements for both pinatas, give them a Joy candy for good measure, then send them to each other to romance.
If you speak with Leafos, she may tell you one of two rumors about Rashberries. One is that if you feed 10 Pumpkins to a Rashberry, they'll turn into a Chippopotamus. The other is that if you feed 10 Tafflies to a Rashberry, they'll turn into a Pigxie. Both of these are false.
Gallery
Valentine's Day 2020 printable card showing a purple and a blue Rashberry in love