From what I found, it helps to increase the shake intensity in the shake settings. Go to motion settings, then find shake, and look for the intensity option (it's underneath the options that set what key you press to emulate the shake,) then just increase it to like, 35cm or something.
This should work for both normal and hybrid.
On macOS applications normally save data in ~/Library/Application Support/xxx where ~ is your home directory and xxx is the application name.
Note that macOS Finder normally hides the Library folder. You can get Finder to show hidden folders with ⌘⇧. (Command+Shift+.). You can also see Library in the Finder Go menu by pressing ⌥ when the Go menu is displayed....
In Dolphin 5.0-14344, to unlock all stages in the USA or PAL versions of Super Smash Bros. Melee:
Open Options > Configuration.
In the General tab, check Enable Cheats.
Right-click Super Smash Bros. Melee in the gamelist and select Properties.
In the Gecko Codes tab, check Unlock All Characters and Stages.
Launch Super Smash Bros. Melee.
To answer your ...