A stab at audio engine.

engine/mysterygift2.asm

@@ -0,0 +1,229 @@
+Function2c642: ; 2c642 (b:4642)
+	ld de, wc800
+	ld a, $1
+	ld [de], a
+	inc de
+	ld a, BANK(sGameData)
+	call GetSRAMBank
+	ld hl, sPlayerData + PlayerID - wPlayerData
+	ld a, [hli]
+	ld [de], a
+	ld b, a
+	inc de
+	ld a, [hl]
+	ld [de], a
+	ld c, a
+	inc de
+	push bc
+	ld hl, sPlayerData + PlayerName - wPlayerData
+	ld bc, NAME_LENGTH
+	call CopyBytes
+	push de
+	ld hl, sPokemonData + PokedexCaught - wPokemonData
+	ld b, (NUM_POKEMON + 7) / 8
+	call CountSetBits
+	pop de
+	pop bc
+	ld a, [wd265]
+	ld [de], a
+	inc de
+	call CloseSRAM
+	call Random
+	and $1
+	ld [de], a
+	inc de
+	call Function2c6ac
+	ld [de], a
+	inc de
+	ld a, c
+	ld c, b
+	ld b, a
+	call Function2c6ac
+	ld [de], a
+	inc de
+	ld a, BANK(sBackupMysteryGiftItem)
+	call GetSRAMBank
+	ld a, [sBackupMysteryGiftItem]
+	ld [de], a
+	inc de
+	ld a, [sBackupMysteryGiftItem + 1]
+	ld [de], a
+	ld a, $14
+	ld [wca00], a
+	call CloseSRAM
+	ld hl, wc800
+	ld de, wc950
+	ld bc, $14
+	jp CopyBytes
+
+Function2c6ac: ; 2c6ac (b:46ac)
+	push de
+	call Random
+	cp $19 ; 10 percent
+	jr c, .tenpercent
+	call Random
+	and $7
+	ld d, a
+	rl d
+	ld e, $80
+.loop
+	rlc e
+	dec a
+	jr nz, .loop
+	ld a, e
+	and c
+	jr z, .skip
+	ld a, $1
+.skip
+	add d
+	jr .done
+
+.tenpercent
+	call Random
+	cp $32 ; 20 percent
+	jr c, .twopercent
+	call Random
+	and $3
+	ld d, a
+	rl d
+	ld e, $80
+.loop2
+	rlc e
+	dec a
+	jr nz, .loop2
+	ld a, e
+	and b
+	jr z, .skip2
+	ld a, $1
+.skip2
+	add d
+	add $10
+	jr .done
+
+.twopercent
+	call Random
+	cp $32 ; 50 ; 20 percent
+	jr c, .pointfourpercent
+	ld a, b
+	swap a
+	and $7
+	add $18
+	jr .done
+
+.pointfourpercent
+	ld a, b
+	and $80
+	ld a, $20
+	jr z, .done
+	ld a, $21
+
+.done
+	pop de
+	ret
+
+MysteryGiftGetItemHeldEffect: ; 2c708 (b:4708)
+	ld a, c
+	cp $25 ; 37
+	jr nc, Function2c722
+	ld hl, Unknown_2c725
+	ld b, 0
+	add hl, bc
+	ld c, [hl]
+	ret
+
+MysteryGiftGetDecoration: ; 2c715 (b:4715)
+	ld a, c
+	cp $25 ; 37
+	jr nc, Function2c722
+	ld hl, Unknown_2c74a
+	ld b, 0
+	add hl, bc
+	ld c, [hl]
+	ret
+
+Function2c722: ; 2c722 (b:4722)
+	ld c, DECO_POLKADOT_BED ; GREAT_BALL
+	ret
+; 2c725 (b:4725)
+
+Unknown_2c725: ; 2c725
+; May or may not be items.
+	db BERRY
+	db PRZCUREBERRY
+	db MINT_BERRY
+	db ICE_BERRY
+	db BURNT_BERRY
+	db PSNCUREBERRY
+	db GUARD_SPEC
+	db X_DEFEND
+	db X_ATTACK
+	db BITTER_BERRY
+	db DIRE_HIT
+	db X_SPECIAL
+	db X_ACCURACY
+	db EON_MAIL
+	db MORPH_MAIL
+	db MUSIC_MAIL
+	db MIRACLEBERRY
+	db GOLD_BERRY
+	db REVIVE
+	db GREAT_BALL
+	db SUPER_REPEL
+	db MAX_REPEL
+	db ELIXER
+	db ETHER
+	db WATER_STONE
+	db FIRE_STONE
+	db LEAF_STONE
+	db THUNDERSTONE
+	db MAX_ETHER
+	db MAX_ELIXER
+	db MAX_REVIVE
+	db SCOPE_LENS
+	db HP_UP
+	db PP_UP
+	db RARE_CANDY
+	db BLUESKY_MAIL
+	db MIRAGE_MAIL
+; 2c74a
+
+Unknown_2c74a: ; 2c74a
+; May or may not be items.
+	db DECO_SNES
+	db DECO_BIG_SNORLAX_DOLL
+	db DECO_BIG_ONIX_DOLL
+	db DECO_BIG_LAPRAS_DOLL
+	db DECO_DOLLS
+	db DECO_PIKACHU_DOLL
+	db DECO_SURF_PIKACHU_DOLL
+	db DECO_CLEFAIRY_DOLL
+	db DECO_JIGGLYPUFF_DOLL
+	db DECO_BULBASAUR_DOLL
+	db DECO_TROPICPLANT
+	db DECO_JUMBOPLANT
+	db DECO_TOWN_MAP
+	db DECO_CHARMANDER_DOLL
+	db DECO_POLIWAG_DOLL
+	db DECO_DIGLETT_DOLL
+	db DECO_BLUE_CARPET
+	db DECO_YELLOW_CARPET
+	db DECO_POSTERS
+	db DECO_PIKACHU_POSTER
+	db DECO_N64
+	db DECO_BIG_DOLLS
+	db DECO_BEDS
+	db DECO_FEATHERY_BED
+	db DECO_POLKADOT_BED
+	db DECO_PIKACHU_BED
+	db DECO_CARPETS
+	db DECO_RED_CARPET
+	db DECO_GREEN_CARPET
+	db DECO_CLEFAIRY_POSTER
+	db DECO_ODDISH_DOLL
+	db DECO_MAGNAPLANT
+	db DECO_GENGAR_DOLL
+	db DECO_CONSOLES
+	db DECO_PINK_BED
+	db DECO_SQUIRTLE_DOLL
+	db DECO_STARMIE_DOLL
+; 2c76f