File:How Sludge are created

In the Grotto Beasts universe, certain Grotto Beasts can be turned into others by using rare special items like Grotto Grains and Grotto Garnets. If you mash a Meowdy under a hydraulic press, it turns into a Sludge. Keep in mind that this can take a lot of power, since Meowdies are very resistant to pressure.