wild pokemon data

- Thanks to Sanqui for many Ruby/Sapphire names. https://github.com/Sanqui/romhacking/blob/master/pokemon/location-area-names

asm/macros/map.s

@@ -0,0 +1,15 @@
+	.macro new_map_group
+	.set cur_map_group, cur_map_group + 1
+	.set cur_map_num, 0
+	.endm
+
+	.macro map_group map_name
+	.set GROUP_\map_name, cur_map_group
+	.set MAP_\map_name, cur_map_num
+	.set cur_map_num, cur_map_num + 1
+	.endm
+
+	.macro map map_name
+	.byte GROUP_\map_name
+	.byte MAP_\map_name
+	.endm

asm/macros/pokemon_data.s

@@ -28,10 +28,10 @@
 	.2byte (\level << 9) | \move
 	.endm
 
-	.macro evo_entry method, parameter, target_pokemon
+	.macro evo_entry method, parameter, target_species
 	.2byte \method
 	.2byte \parameter
-	.2byte \target_pokemon
+	.2byte \target_species
 	.2byte 0 ; padding
 	.endm
 
@@ -42,3 +42,16 @@
 	.macro egg_moves_begin species
 	.2byte 20000 + \species
 	.endm
+
+; If the min level equals the max level, only one level argument is needed.
+	.macro wild_mon species, min_level, max_level
+	.byte \min_level
+
+	.ifb \max_level
+	.byte \min_level
+	.else
+	.byte \max_level
+	.endif
+
+	.2byte SPECIES_\species
+	.endm