Add FIRST_BALL, some FIRST_BERRY_INDEX usage

include/constants/items.h

@@ -17,7 +17,11 @@
 #define ITEM_LUXURY_BALL 11
 #define ITEM_PREMIER_BALL 12
 
-#define LAST_BALL ITEM_PREMIER_BALL
+// Note: If moving ball IDs around, updating FIRST_BALL/LAST_BALL is not sufficient
+//       Several places expect the ball IDs to be first and contiguous (e.g. gBattlescriptsForBallThrow and MON_DATA_POKEBALL)
+//       If adding new balls, it's easiest to insert them after the last ball and increment the below IDs (and removing ITEM_034 for example)
+#define FIRST_BALL ITEM_MASTER_BALL
+#define LAST_BALL  ITEM_PREMIER_BALL
 
 // Pokemon Items
 #define ITEM_POTION 13
@@ -145,6 +149,8 @@
 #define ITEM_FAB_MAIL 131
 #define ITEM_RETRO_MAIL 132
 
+#define FIRST_MAIL_INDEX ITEM_ORANGE_MAIL
+
 // Berries
 #define ITEM_CHERI_BERRY 133
 #define ITEM_CHESTO_BERRY 134
@@ -189,6 +195,10 @@
 #define ITEM_LANSAT_BERRY 173
 #define ITEM_STARF_BERRY 174
 #define ITEM_ENIGMA_BERRY 175
+
+#define FIRST_BERRY_INDEX ITEM_CHERI_BERRY
+#define LAST_BERRY_INDEX  ITEM_ENIGMA_BERRY
+
 #define ITEM_0B0 176
 #define ITEM_0B1 177
 #define ITEM_0B2 178
@@ -467,9 +477,6 @@
 #define ITEMS_COUNT 377
 #define ITEM_FIELD_ARROW ITEMS_COUNT
 
-#define FIRST_BERRY_INDEX             ITEM_CHERI_BERRY
-#define LAST_BERRY_INDEX              ITEM_ENIGMA_BERRY
-
 // Range of berries given out by various NPCS
 #define FIRST_BERRY_MASTER_BERRY      ITEM_POMEG_BERRY
 #define LAST_BERRY_MASTER_BERRY       ITEM_NOMEL_BERRY
@@ -490,8 +497,6 @@
 
 #define ITEM_TO_BERRY(itemId)(((itemId - FIRST_BERRY_INDEX) + 1))
 
-#define FIRST_MAIL_INDEX ITEM_ORANGE_MAIL
-
 #define NUM_TECHNICAL_MACHINES 50
 #define NUM_HIDDEN_MACHINES     8