>>49572952Pokemon on route 102 can be level 3 or level 4. Ralts can only appear at level 4, never at level 3. Repel prevents all encounters with pokemon below the level of your lead, so if I lead with a level 4 pokemon, I can only encounter pokemon that are level 4 on route 102. This knocks off all potential level 3s, making ralts appear more often. This is the repel trick.
