I believe that Aegislash's 50/50s are like SwagPlay, even though it is not mediated by a RNG, since you are hoping that your opponent would do something that would generate a free turn for yourself (well, at the cost of using a turn for Swagger or King's Shield). It is essentially a 50/50 because your opponent and yourself know the potential pay off matrix for the decisions made and the equilibrium is to prevent one's strategy from being predictable and exploitable. If you have a pattern, it can be exploited, and even if one allows his/herself to appear "predictable", to lull the opponent into a sense of security, the short-term cost against this while playing against Aegislash, especially with the potential King's Shield attack drop. The best way not to be exploit is to randomly (50/50) select one's moves (attack, switching out/using a boosting move OR "null" move like a fighting move) while facing Aegislash. To simply things, let's assume that all Aegislash are KS + Three Attacks, then there is almost no prediction (or information asymmetry except if the identity of the coverage move is relevant for a potential switch-in) since the potential payoffs are known to both players and their strategy while using or facing Aegislash is not to have a pattern that can easily be exploited for free turns.For all of those who believe Kings Shield causes fair 50/50s watch this replay. It's sorta like SwagPlay, while it is a 50/50 the user has a much smaller drawback if the 50/50 goes the other way, likewise if it goes their way they get a much bigger reward.
http://replay.pokemonshowdown.com/ou-143005243
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