how can you catch shayman in pearl without action replay or mystery gift please add a video i need help please

What about the Tweaking Glitch(by the way tweaking can be dangerous and could cause data loss)

i doubt that tweaking thing works and i dont think its possible to catch shaymin without action replay or mystery gift i have a shaymin but i used action replay to get u should just go out and buy an action replay theyre only 30 bucks and the walk through everything cheat is already there for pearl