I-I... How?! i'm currently doing a Wonderlocke run of Pokemon X, I just beat Korrina, traded Lapras away, went into the grass, and RAN INTO A SHINY PACHIRISU! I wasn't gunting or anything! ... Oh crap, I only have a Nest Ball... D:
I am on a play through of heart gold. I wasn't planning on catching any Kanto region Pokemon until I could reach Kanto but that was spoiled by a guy giving me his Spearow.