and for the catch modifier.....you must press the keys (L+R i think) to recieve the ammount of balls (649 Mballs and 100 Great balls i think.....then throw away the Mballs till let´s say it reaches 333 then hit select and then throw away the greatBalls till the level you wanted is there.....then select and the poke with dex no. 333 and eg. Lv. 12 will reach you!
alternatively you can use the wild pokemon modifier codes from codejunkies to specify the pokemon by selecting the code in ARDSi or just try this code here out: