Add gen9 item prices + configs (#3834)

* Add gen9 item prices + configs

* Adjust gen 1 PP item costs

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Co-authored-by: Alex <93446519+AlexOn1ine@users.noreply.github.com>

include/config/item.h

@@ -14,6 +14,8 @@
 #define I_USE_EVO_HELD_ITEMS_FROM_BAG FALSE // If TRUE, items such as Razor Claw or Electirizer will be usable from the bag to evolve a Pokémon just like in LA.
 #define I_TYPE_BOOST_POWER GEN_LATEST // In Gen4+, all regular type boosting held items had their power increased from 10% to 20%. eg. Charcoal
 #define I_SELL_VALUE_FRACTION GEN_LATEST // In Gen9+, items sell for 1/4 of their value instead of 1/2.
+#define I_PRICE GEN_LATEST // Some items have varied in value across generations.
+#define I_BERRY_PRICE GEN_7 // Since Berries have become unplantable (Gen8+), their price has gone up.
 
 // TM config
 #define I_REUSABLE_TMS FALSE // In Gen5-8, TMs are reusable. Setting this to TRUE will make all vanilla TMs reusable, though they can also be cherry-picked by setting their importance to 1.

include/item.h

@@ -62,7 +62,7 @@ u16 CountTotalItemQuantityInBag(u16 itemId);
 bool8 AddPyramidBagItem(u16 itemId, u16 count);
 bool8 RemovePyramidBagItem(u16 itemId, u16 count);
 const u8 *ItemId_GetName(u16 itemId);
-u16 ItemId_GetPrice(u16 itemId);
+u32 ItemId_GetPrice(u16 itemId);
 u32 ItemId_GetHoldEffect(u32 itemId);
 u32 ItemId_GetHoldEffectParam(u32 itemId);
 const u8 *ItemId_GetDescription(u16 itemId);