User blog comment:Hotsoup.6891/Best Practices: Mobile Friendly Main Pages/@comment-5701011-20150224175349/@comment-452-20150224203222

The chat "doesn't support other skins".


 * http://c.wikia.com/wiki/Special:Chat?useskin=wikiamobile
 * http://c.wikia.com/wiki/Special:Chat?useskin=monobook

You can get around this by going to http://community.wikia.com/wiki/Special:Chat?useskin=oasis

I don't see why they don't just have the chat ignore the user skin preference and just automatically use the oasis skin by default instead of needing to specify it.