Not A Bug Fur Coat reduces the damage taken by Psyshock

[Quazizata]

What type of bug are you reporting? Mechanics

What is the bug?
Special moves that deal damage based on the target's defense, like Sacred Sword, Psyshock, etc., currently have their damage reduced by the fur coat ability. This is incorrect. On cartridge, their damage is reduced by ice scales, and ice scales only, just like light screen.

Fur coat does not increase the target's defense in any way shape or form. Its effect is limited to reducing the damage of moves that hit for the physical category. This is similar to how the aforementioned abilities are reduced by Light Screen and not reflect. In fact. Fur Coat works precisely the same way as Reflect does to reduce the damage only when calculating the damage.

I tested this on both SV and Sw/Sh. Getting a video to demonstrate this is not easy, in particular because it's hard to fix damage. However, it can be observed.

I do not have access to earlier games to test, but I would be surprised if this behavior was not how it was since the ability was introduced.


See
https://replay.pokemonshowdown.com/gen9customgame-2273358942

Are you able to replicate it? If so, how?
Use Psyshock on a target that has fur coat. Then, use it on a target with identical stats that does not have fur coat. Observe the damage difference.

 

[Cazenovia]

I'm unable to replicate this at all - in my testing in both USUM and SV, I found that Fur Coat does reduce the damage taken by Sacred Sword and Psyshock.

USUM Footage | Fur Coat Persian takes 192, Technician Persian is OHKO'd, which matches with the following ranges from the calc:
0 SpA Keldeo Secret Sword vs. 0 HP / 0 Def Fur Coat Persian-Alola: 174-206 (64.2 - 76%) -- guaranteed 2HKO
0 SpA Keldeo Secret Sword vs. 0 HP / 0 Def Persian-Alola: 344-408 (126.9 - 150.5%) -- guaranteed OHKO

SV Footage | Fur Coat Persian takes 48, Technician Persian takes at least 60, which matches with the following ranges from the calc:
0 SpA Hatterene Psyshock vs. 0 HP / 0 Def Fur Coat Persian-Alola: 42-51 (15.4 - 18.8%) -- possible 6HKO
0 SpA Hatterene Psyshock vs. 0 HP / 0 Def Persian-Alola: 84-100 (30.9 - 36.9%) -- 75.7% chance to 3HKO

 

[Anubis]

Fur coat does not increase the target's defense in any way shape or form. Its effect is limited to reducing the damage of moves that hit for the physical category.

I tested this before Cazenovia replied, but my findings are consistent with theirs. This assertion is false.
Here is additional video proof of Fur Coat remaining a defense modifier in SV.
You can directly see that it's an 8192 defense modifier when hit by Psyshock and Sacred Sword.
I don't know how you tested but it would be better to do damage calcs rather than eyeballing damage in-game.

Debug Log

Psyshock vs Fur Coat

Thread 12 "JobThread1" hit Breakpoint 7, 0x0000004912d823c8 in ?? ()
$29 = 4096
$30 = "attack mod"
$31 = 67
$32 = "attack power before mod"

Thread 12 "JobThread1" hit Breakpoint 8, 0x0000004912d82e90 in ?? ()
$33 = 8192
$34 = "defense mod"
$35 = 163
$36 = "defense power before mod"

Thread 12 "JobThread1" hit Breakpoint 2, 0x0000004912d82eb4 in ?? ()
$37 = 100
$38 = "attacker level"

Thread 12 "JobThread1" hit Breakpoint 4, 0x0000004912d82ec0 in ?? ()
$39 = 67
$40 = "final attack power"

Thread 12 "JobThread1" hit Breakpoint 3, 0x0000004912d82ec8 in ?? ()
$41 = 80
$42 = "move BP"

Thread 12 "JobThread1" hit Breakpoint 11, 0x0000004912d82ee0 in ?? ()
$43 = 15
$44 = "base damage calculation"

Thread 12 "JobThread1" hit Breakpoint 6, 0x0000004912d836bc in ?? ()
$45 = 2
$46 = "damage random roll (% reduction)"

Thread 12 "JobThread1" hit Breakpoint 10, 0x0000004912d83714 in ?? ()
$47 = 4096
$48 = "STAB/tera mod"
$49 = 14
$50 = "damage before STAB/tera mod"

Thread 12 "JobThread1" hit Breakpoint 9, 0x0000004912d83a50 in ?? ()
$51 = 4096
$52 = "damage mod"
$53 = 14
$54 = "damage before mod"

Thread 12 "JobThread1" hit Breakpoint 1, 0x0000004912d83b5c in ?? ()
$55 = 14
$56 = "final damage"

-----

Sacred Sword vs Fur Coat

Thread 2 "MainThread" hit Breakpoint 7, 0x0000004912d823c8 in ?? ()
$57 = 4096
$58 = "attack mod"
$59 = 139
$60 = "attack power before mod"

Thread 2 "MainThread" hit Breakpoint 8, 0x0000004912d82e90 in ?? ()
$61 = 8192
$62 = "defense mod"
$63 = 163
$64 = "defense power before mod"

Thread 2 "MainThread" hit Breakpoint 2, 0x0000004912d82eb4 in ?? ()
$65 = 100
$66 = "attacker level"

Thread 2 "MainThread" hit Breakpoint 4, 0x0000004912d82ec0 in ?? ()
$67 = 139
$68 = "final attack power"

Thread 2 "MainThread" hit Breakpoint 3, 0x0000004912d82ec8 in ?? ()
$69 = 90
$70 = "move BP"

Thread 2 "MainThread" hit Breakpoint 11, 0x0000004912d82ee0 in ?? ()
$71 = 34
$72 = "base damage calculation"

Thread 2 "MainThread" hit Breakpoint 6, 0x0000004912d836bc in ?? ()
$73 = 10
$74 = "damage random roll (% reduction)"

Thread 2 "MainThread" hit Breakpoint 10, 0x0000004912d83714 in ?? ()
$75 = 4096
$76 = "STAB/tera mod"
$77 = 30
$78 = "damage before STAB/tera mod"

Thread 2 "MainThread" hit Breakpoint 9, 0x0000004912d83a50 in ?? ()
$79 = 4096
$80 = "damage mod"
$81 = 30
$82 = "damage before mod"

Thread 2 "MainThread" hit Breakpoint 1, 0x0000004912d83b5c in ?? ()
$83 = 30
$84 = "final damage"