Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Basically, the pitch of Chatot's cry is based on PIDRNG, so if you have a custom chatter recorded for Chatot, every time you look at its summary, it advances PIDRNG by 1 frame.
My guide is written with the idea that you already have 1.) your DS parameters found and 2.) a grasp of capturing flawless/specific spread Pokémon in the wild.
I recommend following bearsfan's youtube video for both of these purposes. You can find a link to his video in my thread.
If you need any help beyond that, I'll see what I can do.
Hey, I have a male phanpy with Heavy slam and a male Numel with magnitude. I can also give you the Wailmer that has heavy slam for any future breeding purposes you might have. Be in wifi in 2-3 minutes.