>>27369221Keeping Amnesia gives you a bit of Special Defence you can use if its holding a Shell Bell (you can get one after you have access to Rock Smash from Johto Route 32), as long as you're not fighting something that's barreling through your team members left and right within a single turn.
Or you could keep Yawn, too, takes a turn to activate but it's by far one of the most accurate sleep-inducing moves out there. Rain Dance is another option to give your Water moves just that much more power. Otherwise you can teach it Strength to make getting around easier.
If it's a female Wooper you can get your laughs by teaching it Attract, it'll work fairly reliably against male Pokemon as a disrupting move.
Note that I'm not saying that Quagsire cannot carry Ice Beam, but only if you have no better Pokemon to give it to. Anything is better than no Ice Beam.