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Such as on reuniclus
Also isnt acid armor technically a bit better since it has more pp(although both probably not going to run out of pp any way)

So, I don't really understand the second part of the question.

Doesn't matter

First part:
Stat-boosting moves are not always viable. For one, most of the time, your opponent won't just let you keep using them. So, moves like that need to be useful, and incredibly efficient. Denfense-boosting moves are.... not efficient. Most of the time, you're gonna want to boost an already substantial stat, and just boosting you defense means that the opponent can continue to attack you. Plus, since you can't heal your 'mons with potions in most competitive formats, unless you've taken absolutely no damage, there's no point. You'll probably just be one-shot anyway. Stat-buffing moves that increase attack (swords dance, quiver dance, tail glow, and the like) give whomever uses them the opportunity to strike back at their opponents. Since they (often) won't even be attacked, their low health is not an issue. Now, they DO have a place. In some stall teams, maybe with perish song or something, the ability to bulk up can be really useful. It's just not a very easy-to-use move, since it doesn't really synergize with alot of more common teams

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One reason is the sheer availability of the moves. Acid Armor is available by level up to 8 evolution chains, and can be bred into another 5. Iron Defense, on the other hand.... is available to what appears to be half of the Pokedex. Iron Defense is also a TR in Sword/Shield, so you don't need to mess with breeding to get it onto the Pokemon you want to put it on.

The other glaring issue with Acid Armor is which specific Pokemon can actually learn it. As already mentioned, it's not exactly an extensive list:

  • Tentacool/Tentacruel
  • Vaporeon
  • Shellos/Gastrodon
  • Solosis/Duosion/Reuniclus
  • Vanillite/Vanillish/Vanilluxe
  • Frillish/Jellicent
  • Litwick/Lampent/Chandelure
  • Cryogonal
  • Shelmet/Accelgor
  • Skrelp/Dragalge
  • Meltan/Melmetal
  • Milcrey/Alcremie

Looking at that list, the only sets that really jump out at me as being favorable are Eviolite Shelmet (maybe) and Melmetal. Iron Defense, by comparison, has a lot more situations and movesets where it can be a valuable asset.

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.....so you don't need to mess with breeding. I don't think so. Many moves that are not useless aren't always by TR or Level up, through breeding also.
Except this question was not in relation to other moves, it is specifically about Acid Armor vs Iron Defense.  Iron Defense is a TR.