First you find the pokemon you want fight it. when you start fighting click use item keep it open until you kill the pokemon you want click use pokeball then if it works it should say you got x exp (x meaning how much exp u got) and x amoun of money. and then it shouls say you caught this pokemon. and then it will repeat the exp and money thing. it always doesn't work though. not 100%.you can use this to catch suicune entai, and many other pokemon if is zapados and articuno and moltres you gonna need alot then maybe a masterball.