Hello! Realizing a weird mechanic happening with Rayquaza's Air Lock and the activation of protosynthesis abilities after Sun is up. If Rayquaza comes in on a sun setter, and then a protosynthesis pokemon enters the field, after Rayquaza leaves the field and sun goes back up, the protosynthesis ability does not activate.
https://replay.pokemonshowdown.com/gen9ubers-1896067156-2g8bt37yhnn5fvs7kub8tsu58pgg4scpw
You can see this occurring here. Rayquaza KOs Koraidon, and then Flutter Mane comes in to revenge it. Rayquaza then leaves the field, and sun goes back up. However, Protosynthesis does not activate.
To confirm this is not a visual bug, we tested this with Scarf Chi-Yu, who generally outspeeds Flutter Mane outside of Sun, but underspeeds it in Sun after a Protosynthesis boost to Speed. The given EV spread on Flutter should allow for the speed boost, and yet it is outsped by the Scarf Chi-Yu.
Not sure if this is how it works in game, but just wanted to point it out regardless. This may also occur with Cloud Nine, but that has not been tested yet.
I did a bit of testing on my Switch and found that Protosynthesis should not deactivate if a Cloud Nine Pokemon switches in. However, on Showdown, this is what Protosynthesis does.
Test battle (on sim):
https://replay.pokemonshowdown.com/gen9ubers-1896099523-yskmve9v5d04ucswiy3omut7q4ilh4gpw
(The stats of the Pokémon in this test battle are identical to the stats of the Pokémon I tested with in-game.)
On the Switch, I used the Koraidon that you get at the start of the game, and it has 188 Speed, and a Golduck with Cloud Nine, with 152 Speed. I encountered a Scream Tail with 142 Speed as its highest stat, meaning Speed got Proto boosted. However, when I switched Golduck in and attacked, Protosynthesis was still active and Golduck was outsped. I also switched in Koraidon afterwards, and it was also outsped.
Pics and clips from Switch:
1. Koraidon's stats
2. Golduck's stats
3. Scream Tail's stats
4. Korai getting outsped turn 1 (it does on sim), Golduck getting outsped (it doesn't on sim), Golduck switching out into Koraidon and Koraidon getting outsped (it doesn't on sim)
Moral of the story: Protosynthesis is one of the weirdest behaving Abilities in the game.
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