I dont see how u-turn answers wonder guard in any way (not like you need to), Im sure you meant magic bounce, no semi-decent pokemon outside of metagross, diancie, and pinsir uses clear body or hyper cutter, and you really want to have another attacking move like hjk or drain punch because featherdance is absolute trash. Also leftovers > lum always on defensive sets.Believe it or not, Hawlucha has a defensive option!
El Gallo Astuto
Hawlucha@Lum Berry/Leftovers
252 HP/252 Spe/4 Def
Jolly Nature
Mold Breaker
-Roost
-Encore
-FeatherDance
-U-turn
This is a defensive pivot set that allows Hawlucha to mess up the opponent and make things easy for the next pokemon incoming. Mold Breaker is the meat of this set as it allows Encore to bypass Magic Guard and Aroma Veil (i think), while allowing FeatherDance to wear down Clear Body and Hyper Cutter pokes. Oh, and U-Turn for the rare Wonder Guard. Hawlucha is meant to come in on certain physical pokes, commonly Ground types who are trigger happy with their Earthquakes, then either Encore them into submission, or Featherdance to soften them or the switchin up. Most people won't expect a defensive set like this so if the opponent is bulky enough they might stay in and take a stab at you. Once you've shown your hand, they'll likely switch into an answer, in which case U-Turn helps keep your momentum. Roost is for obvious healing but pure Fighting is an underrated defensive type, resisting Bug, Dark, and Rock, compounded further by your natural resistances to Fighting and Grass and a Ground immunity. In addition, you are immune to Spikes and Toxic Spikes and you only take neutral damage from Stealth Rock, so it's very easy to switch Hawlucha in and out. Lum Berry is to help you absorb one status, usually from sets you wouldn't expect them to have status moves, but Leftovers is always nice to have.
Keep in mind that despite knowing Encore you shouldn't keep Hawlucha in on status boosters, because without an attack other than U-Turn to punish, you'll be biting off more than you can chew. An Unaware partner can help like Quagsire or Clefable. Don't forget to have a special tank as well, because you'll be U-turning out at the sight of one soon enough.
If you can show me a replay or battle where this is used effectively then I might accept this as neat gimmick but as of now it looks like it squanders hawluchas amazing late game sweeping power for a barely functional pivot that only slightly annoys ground types and boosters until they know it has encore.