That's going to pose severe problems for our project, since the trapping moves have some of the worst coverage typings and power in the game, to the point that that list basically shrinks to Spirit Shackles on the spot given the severe awfulness of Anchor Shot as a coverage move and the sheer underwhelmingness of binding moves for coverage.10. Is it more important for the concept to make the opponent "fear" the trapping move or "expect" the trapping move? Why?
I think it is important to "expect" it to be there due to its nature as a trapping move. Anchor Shot and Spirit Shackle are absolutely incredible moves simply because of their secondary effect (P.S. trapping is counted as a secondary effect, and is effected by Shield Dust and Sheer Force) and 80 base power is suprisingly high for those types physically, especially Ghost. Because of this, there is likely no reason not to run these moves on any moveset that you run. Because of this, you can instead make the opponent fear that they are actually not carrying a trapping move, but are carrying a coverage move for one of its checks. With this idea you can play serious mind games with the opponent. This is why I think it is important to expect the trapping move.
As coverage.
I personally think that Decidueye is a terrible example of what "expecting" a move is, as expecting something means that it is likely that something will happen. With Decidueye, Spirit Shackle is pretty much guaranteed to be run cause there is no better Ghost STAB option than what Spirit Shackle can offer. This is why STAB move trapping is bad for this question, as it turns the "most likely" into a "will".
Simply put, if Anchor Shot is a overage move, CAP will never run it. Steel typing is by far one of the worst coverage typings in the game. Even Talonflame wouldn't use Steel coverage back in Gen 6, and it actively couldn't touch Rock types any other way. Many of the better Fairy pokemon in CAP aren't actually weak to it. Ice effectiveness basically just translates to Syclant, and if Anchor Shot is the only way our CAP deals with Syclant, it's going to have much worse problems than whether it's running a trapping move. Tyranitar is not near so much a threat in CAP as it is in OU, and Stratagem can't even take most resisted hits. That means Anchor Shot is only super effective against Crucibelle and a select number of Fairies. Contrast that to it's inability to do any significant damage to Fire and Water types. Further, at this point we're forced to give it a coverage move to take on Cyclohm, as Cyclohm is pretty much the definition of the sort of mon we're supposed to be trapping and not having coverage for Cyclohm as a physical Pokemon severely hamstrings CAPs usefulness. Even Gamefreak realized how bad Anchor Shot is for coverage and actually gave Dhelmise Steel STAB on its ability to compensate for how dreadful it is.
We're starting to fair a little better with Spirit Shackles, but not much. Pokemon weak to types weak to Ghost like Tapu Lele and Alakazam will opt to run Ghost coverage. That limits us to just three types: Fighting, Poison, and Psychic. Without one of these types, Spirit Shackles also won't see play as anything but a gimmick. Adding to the complications, Poison and Fighting are both heavily overrepresented in the CAP metagame, meaning CAP will suffer from and overabundance of competition.
Frankly speaking, this interpretation seems like it will either end with the trapping move being unplayable or CAP23 itself being unplayable.