snaelstrom has been in a poor spot since inception despite the many things going for it, and has a lot of design decisions which i really don't understand
pyroak is bad and has been bad for a long time
plasmanta also has a lot going for it but it held back by a ton of issues
kitsunoh and mollux idrc about too much, former just needs tuning and latter faces a metagame unkind to it imo
smokomodo is a disaster in terms of a product but it like still sort-of functions.
caribolt got screwed by return getting axed and i don't really know what to do about it
stratagem struggles because being a pure rock type is bad, and really this one is on gamefreak more than us given its supposed to be a mono-rock special attacker and nothing has been done since gen 4 to really improve such a concept.