pokecrystal-board/engine/pokerus_tick.asm

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ApplyPokerusTick: ; 13988
; decreases all pokemon's pokerus counter by b. if the lower nybble reaches zero, the pokerus is cured.
ld hl, PartyMon1PokerusStatus ; PartyMon1 + MON_PKRS
ld a, [PartyCount]
and a
ret z ; make sure it's not wasting time on an empty party
ld c, a
.loop
ld a, [hl]
and $f ; lower nybble is the number of days remaining
jr z, .next ; if already 0, skip
sub b ; subtract the number of days
jr nc, .ok ; max(result, 0)
xor a
.ok
ld d, a ; back up this value because we need to preserve the strain (upper nybble)
ld a, [hl]
and $f0
add d
ld [hl], a ; this prevents a cured pokemon from recontracting pokerus
.next
ld de, PARTYMON_STRUCT_LENGTH
add hl, de
dec c
jr nz, .loop
ret