Add NUM_MON_PIC_FRAMES, and trainer pic size constants

include/battle.h

@@ -593,7 +593,7 @@ struct MonSpritesGfx
         u8 *byte[MAX_BATTLERS_COUNT];
     } sprites;
     struct SpriteTemplate templates[MAX_BATTLERS_COUNT];
-    struct SpriteFrameImage frameImages[MAX_BATTLERS_COUNT][4];
+    struct SpriteFrameImage frameImages[MAX_BATTLERS_COUNT][MAX_MON_PIC_FRAMES];
     u8 unusedArr[0x80];
     u8 *barFontGfx;
     void *unusedPtr;

include/constants/pokemon.h

@@ -260,6 +260,14 @@
 #define MON_PIC_HEIGHT 64
 #define MON_PIC_SIZE (MON_PIC_WIDTH * MON_PIC_HEIGHT / 2)
 
+// Most pokemon have 2 frames (a default and an alternate for their animation).
+// There are 4 exceptions:
+// - Castform has 4 frames, 1 for each form
+// - Deoxys has 2 frames, 1 for each form
+// - Spinda has 1 frame, presumably to avoid the work of animating its spots
+// - Unown has 1 frame, presumably to avoid the work of animating all 28 of its forms
+#define MAX_MON_PIC_FRAMES 4
+
 #define BATTLE_ALIVE_EXCEPT_ACTIVE  0
 #define BATTLE_ALIVE_ATK_SIDE       1
 #define BATTLE_ALIVE_DEF_SIDE       2

include/data.h

@@ -7,6 +7,12 @@
 
 #define MAX_TRAINER_ITEMS 4
 
+#define TRAINER_PIC_WIDTH 64
+#define TRAINER_PIC_HEIGHT 64
+#define TRAINER_PIC_SIZE (TRAINER_PIC_WIDTH * TRAINER_PIC_HEIGHT / 2)
+
+#define MAX_TRAINER_PIC_FRAMES 4 // ? Red and Leaf's back pics have 5 frames
+
 enum {
     BATTLER_AFFINE_NORMAL,
     BATTLER_AFFINE_EMERGE,