More comments

Fix some constants

engine/battle/core.asm

@@ -857,7 +857,7 @@ GetMovePriority: ; 3c5c5
 	cp -1
 	jr nz, .loop
 
-	ld a, 1
+	ld a, BASE_PRIORITY
 	ret
 
 .done
@@ -4808,7 +4808,7 @@ PrintPlayerHUD: ; 3dfbf
 	ld [de], a
 	ld hl, BattleMonLevel
 	ld de, TempMonLevel
-	ld bc, $0011
+	ld bc, $11
 	call CopyBytes
 	ld a, [CurBattleMon]
 	ld hl, PartyMon1Species

engine/item_effects.asm

@@ -1436,7 +1436,7 @@ RareCandy: ; ef14
 	call TextBox
 
 	hlcoord 11, 1
-	ld bc, $0004
+	ld bc, 4
 	predef PrintTempMonStats
 
 	call WaitPressAorB_BlinkCursor
@@ -2572,7 +2572,7 @@ Mysteryberry: ; f5bf
 	cp SKETCH
 	jr z, .CantUsePPUpOnSketch
 
-	ld bc, $0015
+	ld bc, MON_PP - MON_MOVES
 	add hl, bc
 	ld a, [hl]
 	cp 3 << 6 ; have 3 PP Ups already been used?