While everyone is pitching potential abilities to work with, I have something I want to bring up. Should CAP 27's abilities be focused on quality or quantity? Hopefully, I can explain what my thought process behind this.
Option A: Quality
1 super good ability that we build around. The main examples I have been seeing are Magic Guard and Regenerator. These abilities do a lot for 27 and 99% of the time, will be seen as the go to ability. For example pre Pokémon Home, :Clefable: had 2 abilities, Magic Guard and Cute Charm. Magic Guard is such an versatile ability that does multiple things and Cute Charm is flavor so Clef always uses Magic Guard. Or :Dracovish: picking between Water Absorb and Strong Jaw. Water Absorb is not an inherently bad ability but Strong Jaw is so much better for what Draco aims to do.
Option B: Quantity
Give 27 2-3 good but not amazing abilities that provide different forms of support. For example, Sticky Hold, Rough Skin, and Poison Touch. None of these abilities on their own are superior to Magic Guard or Regenerator but they each provide a different form of team support. Kind of like how :Equilibra: picks between Bulletproof and Levitate, :Jumbao: with Trace or Drought, or Tomo with Intimidate and Prankster. These abilities shouldn't be superior to the super powerful ability for the sake of balance, but instead give players options in what kind of team support 27 needs to be for their team. Since Team Support comes in many forms, multiple equally viable abilities is a route I think should be considered.
EDIT: Option C: Quality+Quantity
Already got cbfer discussing with me about this so I need to formally address this possibility. What if we give 27 2 distinctly viable and super good abilities like Magic Guard and Regen? That is an route to go down, but I have some concerns with this approach. The main issue is that you get the best of both worlds. Super powerful and versatile abilities, but instead of having a single go to, there are 2. This can be balanced by stats and movepool, but I don't want movepool or stats super constrained by the combo of quantity+quality abilities.
Like Ive said in a previous post, the discussion and abilities brought up are great but there are multiple ways of approaching this concept. And when it comes to abilities, I think these are the 2 main routes we can go down. Thank you for reading, and feel free to disagree with my opinion.
Just weighting in on the options between Quantity and Quality. Even if we were to give it three subpar abilities or three amazing ones eventually the Mon will generally stick to the one ability that helps it the most in the current metagame. Very few people run bulletproof :Equilibra: when Levitate makes it immune to one of its weaknesses, turns it into the best spinner in the tier and just generally better in most regards. What we should aim for in my opinion is an ability that assist it in its main goal as well as 1-2 others that have a set and useful niche goal like :Equilibra:. Not trying to jump discussions but even if the 2nd or 3rd ability doesn't fit the concept 100%, as long as the primary fits the criteria. The original purpose of CAP was to better understand the Meta of OU and the core mechanics of the game. That all said, we should focus on Option B. Even if the Ability is strong in a vacuum doesn't mean it will be a strong option on all Pokemon. Levitate is one of the best abilities in the game but almost functionally useless on Rotom-Fan for example. We should focus on making sure CAP27 has Abilities that fit the concept as well as giving it enough options so it isn't static and stale to play. Fun is the other goal of the Create-A-Pokemon and stifling options can be anti-fun imo.

























