First open up two tabs on the first tab have you vs a wild Pokemon, then on the second tab vs someone with Pokemon you want. on the second tab switch Pokemon from your party and quickly in the time you have go to the first tab press refresh. as i have said before if you dont have a refresh button right click and look at the options you have. you notice nothing has happened. for this part you may want a slow computer because you only have the time the loading for Pokemon swap on the second tab. so this is important, keep doing this cycle, you will eventually find that the pokemon on the wild pokemon battle you have been using will change. now eventually you find that the pokemon you are vsing on the wild battle has changed as well. since it is a wild pokemon battle you can catch it.dont say it doesnt work because if you look at my account on pokemon indigo you see that one of my friends has a lv 100 cresselia and so do i. both the same lv and all the same attacks. so dont hate on me.