EV
Banned deucer.
That's funny because I was theorymonning defensive Azu the other day with word and asterat on separate occasions. I came up with Thick Fat to sponge just about anything Zard-X can throw at it, but Sap Sipper has its uses, too I guess. The biggest problem with Azu without Huge Power is its pitiful attack stats. Sure, Scald is useful for the burn rate, but it still can't do much even on SE hits. It would have to function entirely for support without expecting any return KOs in the process.So an idea that's been roaming around my brain is defensive Azumarril. Now normally Azu can't run a defensive set that effectively due to the lack of recovery and/or wall utility. However, in STABmons it has access to Recover(/Slack Off / Soft-Boiled) and a lot of utility moves, the most notable one being Whirlwind, although things like Lovely Kiss and Rapid Spin do deserve some mention. What's cool about Sap Sipper Azumarril is that it can kind of wall both Zards (although it's hard for it to do so both at the same time, due to ZardX getting V-Create and ZardY getting Oblivion Wing). It can also wall Greninja unless it runs something silly like Hidden Power Poison or something. Of course, something has to be put to sleep first so that Greninja doesn't just Dark Void him, but still. This might just all be theory mon and it isn't very effective, but it could be neat. A set of Scald / Recover / Whirlwind / Seismic Toss or something like that could work. Maybe throw Toxic in there somewhere (probably over Scald). I don't know if it would be better to run physically or specially defensive atm, but both have perks (and they help wall a certain type of Zard.)
Again, I haven't play tested this (doesn't really fit my more offensive playstyle and ladder is kind of empty atm) but maybe it could be good?
Besides the moves you listed, it can also run Heal Bell, Rapid Spin, Perish Song and other options, though arguably it isn't nearly as good a spinner as say Chansey. The only thing Azu has over her is its resists due to its decent typing, making it a solid Zard-X check. (I think Chansey and Heatran are better Zard-Y checks myself.)
asterat mentioned bulky Huge Power, however. That's a whole 'nother conversation, though.