Saying that Kingdra or any Water-type Rain sweeper is stopped by Steel-types is wrong at best and misdirecting at worst.
252SpAtk Life Orb Kingdra (+SAtk) Hydro Pump in Rain vs 252HP/224SpDef Leftovers Jirachi (+SpDef): 61% - 72% (249 - 294 HP). Guaranteed 2HKO.
Ferrothorn stops Rain sweepers (especially the Swift Swimmers) because he resists their STABs and typically is only vulnerable to their coverage. Ludicolo and Kabutops can get around him with coverage, but their attacks are risky.
FaceFaceFace: "Genesect is like the Terminator. Scary when he's coming after you, absolutely lovely with ridiculous punch-lines when he's on your side."