It's an ability that increases Accuracy of moves by 30%. It also has an out-of-battle effect that happens when a Pokmon with it is at the head of your party...it increases the chance of finding wild Pokmon holding an item. Whether or not you can obtain all of these in the game is all up to you.
CRD. Type:Abbreviation. Definitions 1. Abbreviation for chronic respiratory disease.
1 Osteoporosis, a condition characterized by reduced bone mineral density and increased bone fragility.  Rickets, a childhood disease characterized by impeded growth and deformity of the long bones. The earliest sign of subclinical vitamin D deficiency is craniotabes, abnormal softening or thinning of the skull.