diff --git a/include/config/item.h b/include/config/item.h
index 8aaadbe84..0cd89b612 100644
--- a/include/config/item.h
+++ b/include/config/item.h
@@ -12,6 +12,7 @@
 #define I_GRISEOUS_ORB_FORM_CHANGE      GEN_LATEST  // In Gen9+, the Griseous Orb no longer changes Giratina's form when held.
 #define I_GEM_BOOST_POWER               GEN_LATEST  // In Gen5+, the Gem boost power was reduced from 50% to 30%.
 #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
 
 // 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.
diff --git a/src/data/items.h b/src/data/items.h
index 842dae6bd..6990e7cde 100644
--- a/src/data/items.h
+++ b/src/data/items.h
@@ -14,6 +14,12 @@
     #define GEM_BOOST_PARAM 50
 #endif
 
+#if I_TYPE_BOOST_POWER >= GEN_4 // For non Pokémon-specific type-boosting held items.
+    #define TYPE_BOOST_PARAM 20 
+#else
+    #define TYPE_BOOST_PARAM 10
+#endif
+
 const struct Item gItems[] =
 {
     [ITEM_NONE] =
@@ -5169,7 +5175,7 @@ const struct Item gItems[] =
         .name = _("Silk Scarf"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_NORMAL_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sSilkScarfDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5182,7 +5188,7 @@ const struct Item gItems[] =
         .name = _("Charcoal"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_FIRE_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sCharcoalDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5195,7 +5201,7 @@ const struct Item gItems[] =
         .name = _("Mystic Water"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_WATER_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sMysticWaterDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5208,7 +5214,7 @@ const struct Item gItems[] =
         .name = _("Magnet"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_ELECTRIC_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sMagnetDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5221,7 +5227,7 @@ const struct Item gItems[] =
         .name = _("Miracle Seed"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_GRASS_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sMiracleSeedDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5234,7 +5240,7 @@ const struct Item gItems[] =
         .name = _("Never-MeltIce"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_ICE_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sNeverMeltIceDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5247,7 +5253,7 @@ const struct Item gItems[] =
         .name = _("Black Belt"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_FIGHTING_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sBlackBeltDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5260,7 +5266,7 @@ const struct Item gItems[] =
         .name = _("Poison Barb"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_POISON_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sPoisonBarbDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5273,7 +5279,7 @@ const struct Item gItems[] =
         .name = _("Soft Sand"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_GROUND_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sSoftSandDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5286,7 +5292,7 @@ const struct Item gItems[] =
         .name = _("Sharp Beak"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_FLYING_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sSharpBeakDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5299,7 +5305,7 @@ const struct Item gItems[] =
         .name = _("Twisted Spoon"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_PSYCHIC_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sTwistedSpoonDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5312,7 +5318,7 @@ const struct Item gItems[] =
         .name = _("Silver Powder"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_BUG_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sSilverPowderDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5325,7 +5331,7 @@ const struct Item gItems[] =
         .name = _("Hard Stone"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_ROCK_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sHardStoneDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5338,7 +5344,7 @@ const struct Item gItems[] =
         .name = _("Spell Tag"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_GHOST_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sSpellTagDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5351,7 +5357,7 @@ const struct Item gItems[] =
         .name = _("Dragon Fang"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_DRAGON_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sDragonFangDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5364,7 +5370,7 @@ const struct Item gItems[] =
         .name = _("Black Glasses"),
         .price = 1000,
         .holdEffect = HOLD_EFFECT_DARK_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sBlackGlassesDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -5377,7 +5383,7 @@ const struct Item gItems[] =
         .name = _("Metal Coat"),
         .price = 2000,
         .holdEffect = HOLD_EFFECT_STEEL_POWER,
-        .holdEffectParam = 20,
+        .holdEffectParam = TYPE_BOOST_PARAM,
         .description = sMetalCoatDesc,
         .pocket = POCKET_ITEMS,
         .type = EVO_HELD_ITEM_TYPE,