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Naviathan is considered mediocre, though that's more because nobody has figured out its best set. Calm Mind is good against stall, so it has a niche.

Revenankh is also pretty mediocre, as it's very one-dimensional and hard to set up properly, but can be supported as a win-con.

Krillowatt is mediocre because of its lack of high-powered moves, but it's bulky enough and has enough coverage to justify it.

All in all, Mala and Voodoom are pretty much the only bad ones. There are some mediocre ones, but they're plenty usable.

For Navi, I suggest physically defensive CM with Heatproof, your moveset being Calm Mind, Scald, Flash Cannon / Taunt , and Slack Off.

To be completely honest, I'm more of a "textbook leaner," even though I do go on Pokemon Showdown here and there. My username is the same as on here, but without the space.

I'm well aware of that set, though thanks anyway. I have seen you every now and then, you should know what my username is by now

Navi is surprisingly good running choice specs with high powered moves like hurricane. Sorry, felt obligated to post this when naviathan starts being discussed. :P