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I'm looking for the code for the scene module, anyone knows how I can find the code for built-in modules?

Many of the Pythonista-specific modules are written in C (or Objective-C) and compiled, so you can't see the source code for them. To find out if that's the case, import and look at the module in the Python console:

>>> import console
>>> console
<module 'console' (built-in)>

The "built-in" part means that the module is compiled and not written in Python.

Some modules (like scene) are actually made of two modules: the main module is written in Python, and it imports a second module that is compiled. For example, you can see the location of the scene module's Python code:

>>> import scene
>>> scene
<module 'scene' from '/var/containers/Bundle/Application/.../Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/scene.py'>

However if you look into the scene.py file, you can see that it imports a _scene2 module, which is compiled:

>>> import _scene2
>>> scene2
<module '_scene2' (built-in)>

That means you can read the parts of the scene module that are written in Python (scene), but not those that are compiled (_scene2).