Identify remaining Mystery Gift labels and constants

Source: https://projectpokemon.org/home/forums/topic/43930-mystery-gift-reverse-engineering-of-ir-protocol/

engine/link/mystery_gift_2.asm

@@ -1,6 +1,6 @@
-PrepMysteryGiftDataToSend:
+StageDataForMysteryGift:
 	ld de, wMysteryGiftStaging
-	ld a, $1 + GS_VERSION
+	ld a, GS_VERSION + 1
 	ld [de], a
 	inc de ; wMysteryGiftStaging+1
 	ld a, BANK(sGameData)
@@ -46,10 +46,10 @@ PrepMysteryGiftDataToSend:
 	ld a, [sBackupMysteryGiftItem]
 	ld [de], a
 	inc de
-	ld a, [sBackupMysteryGiftItem + 1]
+	ld a, [sNumDailyMysteryGiftPartnerIDs]
 	ld [de], a
-	ld a, $14
-	ld [wca00], a
+	ld a, wMysteryGiftPlayerDataEnd - wMysteryGiftPlayerData
+	ld [wUnusedMysteryGiftStagedDataLength], a
 	call CloseSRAM
 	ld hl, wMysteryGiftStaging
 	ld de, wMysteryGiftPlayerData
@@ -121,7 +121,7 @@ PrepMysteryGiftDataToSend:
 	pop de
 	ret
 
-MysteryGiftGetItemHeldEffect:
+MysteryGiftGetItem:
 	ld a, c
 	cp MysteryGiftItems.End - MysteryGiftItems
 	jr nc, MysteryGiftFallbackItem

engine/menus/intro_menu.asm

@@ -173,12 +173,13 @@ _ResetWRAM:
 	ld [wRoamMon2MapNumber], a
 	ld [wRoamMon3MapNumber], a
 
-	ld a, BANK(sMysteryGiftItem)
+	ld a, BANK(sMysteryGiftItem) ; aka BANK(sMysteryGiftUnlocked)
 	call OpenSRAM
 	ld hl, sMysteryGiftItem
 	xor a
 	ld [hli], a
-	dec a
+	assert sMysteryGiftItem + 1 == sMysteryGiftUnlocked
+	dec a ; -1
 	ld [hl], a
 	call CloseSRAM
 
@@ -370,7 +371,7 @@ Continue:
 	ld c, 20
 	call DelayFrames
 	farcall JumpRoamMons
-	farcall MysteryGift_CopyReceivedDecosToPC
+	farcall CopyMysteryGiftReceivedDecorationsToPC
 	farcall ClockContinue
 	ld a, [wSpawnAfterChampion]
 	cp SPAWN_LANCE

engine/menus/main_menu.asm

@@ -206,7 +206,7 @@ MainMenu_GetWhichMenu:
 	ld a, BANK(sNumDailyMysteryGiftPartnerIDs)
 	call OpenSRAM
 	ld a, [sNumDailyMysteryGiftPartnerIDs]
-	cp -1
+	cp -1 ; locked?
 	call CloseSRAM
 	jr nz, .mystery_gift
 	; This check makes no difference.

engine/overworld/time.asm

@@ -272,7 +272,7 @@ DoMysteryGiftIfDayHasPassed:
 	ld hl, wBuffer1
 	call InitOneDayCountdown
 	call CloseSRAM
-	farcall Function1050c8
+	farcall ResetDailyMysteryGiftLimitIfUnlocked
 
 .not_timed_out
 	ld a, BANK(sMysteryGiftTimer)