How can I add https://pokespoleczenstwo.fandom.com/pl/wiki/MediaWiki:Sidebar to my wiki? Well, I can't, as it exists only as internal data. It's SO bad you had to get rid of the Monobook skin due to copyright issues (see here, why Monobook was removed).
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PseudoMonobook or Pseudo-Vector are the closest you'll get, but you can only use them in your personal css and js, not on a site itself.
(edited by Evil Amelia)