diff --git a/data/items.ts b/data/items.ts
index e0573a2043..74943ef6df 100644
--- a/data/items.ts
+++ b/data/items.ts
@@ -1101,6 +1101,12 @@ export const Items: {[itemid: string]: ItemData} = {
 		name: "Cornerstone Mask",
 		spritenum: 758,
 		forcedForme: "Ogerpon-Cornerstone",
+		onBasePowerPriority: 15,
+		onBasePower(basePower, user, target, move) {
+			if (user.baseSpecies.name.startsWith('Ogerpon-Cornerstone')) {
+				return this.chainModify([4915, 4096]);
+			}
+		},
 		itemUser: ["Ogerpon-Cornerstone"],
 		onTakeItem(item, source) {
 			if (source.baseSpecies.baseSpecies === 'Ogerpon') return false;
@@ -2504,6 +2510,12 @@ export const Items: {[itemid: string]: ItemData} = {
 		name: "Hearthflame Mask",
 		spritenum: 760,
 		forcedForme: "Ogerpon-Hearthflame",
+		onBasePowerPriority: 15,
+		onBasePower(basePower, user, target, move) {
+			if (user.baseSpecies.name.startsWith('Ogerpon-Hearthflame')) {
+				return this.chainModify([4915, 4096]);
+			}
+		},
 		itemUser: ["Ogerpon-Hearthflame"],
 		onTakeItem(item, source) {
 			if (source.baseSpecies.baseSpecies === 'Ogerpon') return false;
@@ -7100,6 +7112,12 @@ export const Items: {[itemid: string]: ItemData} = {
 		name: "Wellspring Mask",
 		spritenum: 759,
 		forcedForme: "Ogerpon-Wellspring",
+		onBasePowerPriority: 15,
+		onBasePower(basePower, user, target, move) {
+			if (user.baseSpecies.name.startsWith('Ogerpon-Wellspring')) {
+				return this.chainModify([4915, 4096]);
+			}
+		},
 		itemUser: ["Ogerpon-Wellspring"],
 		onTakeItem(item, source) {
 			if (source.baseSpecies.baseSpecies === 'Ogerpon') return false;