Instructions
Travel to either Route 203 or Route 204 during the morning or at night. Route 203 is located to the east of Jubilife City, while Route 204 is located to the north of Jubilife City.
Roam through these regions and seek out random encounters with wild Pokemon until you find a Ralts. There is a one in five chance that any given Pokemon you encounter here will be a Ralts, which will be between levels four and six.
Attack the Ralts. Battle it with Dark, Bug or Ghost-type Pokemon; Ralts is vulnerable to them. Throw a Poke Ball to capture it when it is weakened.