Topic on Manual talk:How to make a MediaWiki skin

Skins should not add additional functionality to the MediaWiki experience. Their sole responsibility is to render data passed to them.

How to show page stat? along with the view count, is there any other stat is available from core?

This is a bit out of scope for a skin. I would expect an extension to provide this kind of data. We don't have such data in MediaWiki core.

Not extensions can use Manual:Hooks/SkinAfterContent to output such information provided the skin renders html-after-content.