Rename MON_ID to MON_OT_ID (pret/pokecrystal#1114)

* Rename MON_ID to MON_TRAINER_ID

The constant name MON_ID implies it relates to the ID number of the
Pokémon itself. However, it actually refers to the Trainer ID number of
the Pokémon's Original Trainer. Renaming it to MON_TRAINER_ID makes it
substantially more clear what its purpose is.

The original definition of MON_ID is preserved in macros/legacy.asm

* Remove MON_ID from macros/legacy.asm

Co-authored-by: Sylvie <35663410+Rangi42@users.noreply.github.com>

* Apply rename to missed file

* Rename to `MON_OT_ID`

---------

Co-authored-by: SnorlaxMonster <snorlaxmonster@users.noreply.github.com>
Co-authored-by: Sylvie <35663410+Rangi42@users.noreply.github.com>
Co-authored-by: vulcandth <vulcandth@gmail.com>

constants/pokemon_data_constants.asm

@@ -77,7 +77,7 @@ rsreset
 DEF MON_SPECIES            rb
 DEF MON_ITEM               rb
 DEF MON_MOVES              rb NUM_MOVES
-DEF MON_ID                 rw
+DEF MON_OT_ID              rw
 DEF MON_EXP                rb 3
 DEF MON_STAT_EXP           rw NUM_EXP_STATS
 rsset MON_STAT_EXP

engine/battle/core.asm

@@ -3633,9 +3633,9 @@ InitBattleMon:
 	ld a, MON_SPECIES
 	call GetPartyParamLocation
 	ld de, wBattleMonSpecies
-	ld bc, MON_ID
+	ld bc, MON_OT_ID
 	call CopyBytes
-	ld bc, MON_DVS - MON_ID
+	ld bc, MON_DVS - MON_OT_ID
 	add hl, bc
 	ld de, wBattleMonDVs
 	ld bc, MON_POKERUS - MON_DVS
@@ -3719,9 +3719,9 @@ InitEnemyMon:
 	ld hl, wOTPartyMon1Species
 	call GetPartyLocation
 	ld de, wEnemyMonSpecies
-	ld bc, MON_ID
+	ld bc, MON_OT_ID
 	call CopyBytes
-	ld bc, MON_DVS - MON_ID
+	ld bc, MON_DVS - MON_OT_ID
 	add hl, bc
 	ld de, wEnemyMonDVs
 	ld bc, MON_POKERUS - MON_DVS
@@ -6834,7 +6834,7 @@ GiveExperiencePoints:
 	call Divide
 ; Boost Experience for traded Pokemon
 	pop bc
-	ld hl, MON_ID
+	ld hl, MON_OT_ID
 	add hl, bc
 	ld a, [wPlayerID]
 	cp [hl]

engine/battle/effect_commands.asm

@@ -664,7 +664,7 @@ BattleCommand_CheckObedience:
 
 	; If the monster's id doesn't match the player's,
 	; some conditions need to be met.
-	ld a, MON_ID
+	ld a, MON_OT_ID
 	call BattlePartyAttr
 
 	ld a, [wPlayerID]

engine/events/daycare.asm

@@ -485,7 +485,7 @@ DayCare_GiveEgg:
 	call AddNTimes
 	ld b, h
 	ld c, l
-	ld hl, MON_ID + 1
+	ld hl, MON_OT_ID + 1
 	add hl, bc
 	push hl
 	ld hl, MON_MAXHP

engine/events/halloffame.asm

@@ -167,7 +167,7 @@ GetHallOfFameParty:
 	ld [de], a
 	inc de
 
-	ld hl, MON_ID
+	ld hl, MON_OT_ID
 	add hl, bc
 	ld a, [hli]
 	ld [de], a

engine/events/lucky_number.asm

@@ -150,7 +150,7 @@ CheckForLuckyNumberWinners:
 .done
 	pop hl
 	push hl
-	ld de, MON_SPECIES - MON_ID
+	ld de, MON_SPECIES - MON_OT_ID
 	add hl, de
 	ld a, [hl]
 	pop hl

engine/events/magikarp.asm

@@ -11,7 +11,7 @@ CheckMagikarpLength:
 	cp MAGIKARP
 	jr nz, .not_magikarp
 
-	; Now let's compute its length based on its DVs and ID.
+	; Now let's compute its length based on its DVs and Trainer ID.
 	ld a, [wCurPartyMon]
 	ld hl, wPartyMon1Species
 	ld bc, PARTYMON_STRUCT_LENGTH
@@ -22,7 +22,7 @@ CheckMagikarpLength:
 	ld d, h
 	ld e, l
 	pop hl
-	ld bc, MON_ID
+	ld bc, MON_OT_ID
 	add hl, bc
 	ld b, h
 	ld c, l

engine/pokemon/breeding.asm

@@ -294,7 +294,7 @@ HatchEggs:
 	ld [hli], a
 	ld a, [de]
 	ld [hl], a
-	ld hl, MON_ID
+	ld hl, MON_OT_ID
 	add hl, bc
 	ld a, [wPlayerID]
 	ld [hli], a