diff --git a/config/formats.js b/config/formats.js
index 60f60a8c99..14c907d268 100644
--- a/config/formats.js
+++ b/config/formats.js
@@ -351,20 +351,12 @@ exports.Formats = [
 	///////////////////////////////////////////////////////////////////
 
 	{
-		name: "350 Cup",
+		name: "Stat Switch",
 		section: "OM of the Month",
-		column: 2,
 
-		mod: '350cup',
-		ruleset: ['Ubers', 'Evasion Moves Clause'],
-		banlist: ['Abra', 'Cranidos', 'Darumaka', 'Gastly', 'Pawniard', 'Smeargle', 'Spritzee', 'DeepSeaScale', 'DeepSeaTooth', 'Light Ball', 'Thick Club'],
-		validateSet: function (set) {
-			var template = Tools.getTemplate(set.species);
-			var item = this.getItem(set.item);
-			if (item.name === 'Eviolite' && Object.values(template.baseStats).sum() <= 350) {
-				return ['Eviolite is banned on Pokémon with 350 or lower BST.'];
-			}
-		}
+		mod: 'statswitch',
+		ruleset: ['OU'],
+		banlist: ['Azumarill']
 	},
 	{
 		name: "[Seasonal] Strikes Back",
@@ -702,6 +694,22 @@ exports.Formats = [
 			'Omanyte'
 		]
 	},
+	{
+		name: "350 Cup",
+		section: "Other Metagames",
+
+		mod: '350cup',
+		searchShow: false,
+		ruleset: ['Ubers', 'Evasion Moves Clause'],
+		banlist: ['Abra', 'Cranidos', 'Darumaka', 'Gastly', 'Pawniard', 'Smeargle', 'Spritzee', 'DeepSeaScale', 'DeepSeaTooth', 'Light Ball', 'Thick Club'],
+		validateSet: function (set) {
+			var template = Tools.getTemplate(set.species);
+			var item = this.getItem(set.item);
+			if (item.name === 'Eviolite' && Object.values(template.baseStats).sum() <= 350) {
+				return ['Eviolite is banned on Pokémon with 350 or lower BST.'];
+			}
+		}
+	},
 	{
 		name: "Averagemons",
 		section: "Other Metagames",
diff --git a/mods/statswitch/scripts.js b/mods/statswitch/scripts.js
new file mode 100644
index 0000000000..5e09a0cb66
--- /dev/null
+++ b/mods/statswitch/scripts.js
@@ -0,0 +1,53 @@
+exports.BattleScripts = {
+	init: function () {
+		var battleFormeIDs = {'Mega':1, 'Mega-X':1, 'Mega-Y':1};
+		// due to a happy coincidence, no other Pokémon having HP as its min xor max stat changes forme in-battle
+		var battleAltFormes = [];
+		for (var i in this.data.Pokedex) {
+			var dexEntry = this.data.Pokedex[i];
+			if (dexEntry.forme in battleFormeIDs) {
+				// should be processed after their base forme is
+				battleAltFormes.push(i);
+				continue;
+			}
+			var maxValue = dexEntry.baseStats[Object.max(dexEntry.baseStats)];
+			var minValue = dexEntry.baseStats[Object.min(dexEntry.baseStats)];
+
+			if (maxValue === minValue) continue;
+
+			var modStats = {};
+			for (var statID in dexEntry.baseStats) {
+				if (dexEntry.baseStats[statID] === maxValue) {
+					modStats[statID] = minValue;
+				} else if (dexEntry.baseStats[statID] === minValue) {
+					modStats[statID] = maxValue;
+				} else {
+					modStats[statID] = dexEntry.baseStats[statID];
+				}
+			}
+			this.modData('Pokedex', i).baseStats = modStats;
+		}
+		// megas inherit the swapped HP from the base forme and ignore it for their own swap
+		for (var i = 0, len = battleAltFormes.length; i < len; i++) {
+			var dexEntry = this.data.Pokedex[battleAltFormes[i]];
+			var swappableStats = Object.reject(dexEntry.baseStats, 'hp');
+
+			var maxValue = swappableStats[Object.max(swappableStats)];
+			var minValue = swappableStats[Object.min(swappableStats)];
+
+			if (maxValue === minValue) continue;
+
+			var modStats = {'hp': this.data.Pokedex[toId(dexEntry.baseSpecies)].baseStats['hp']};
+			for (var statID in swappableStats) {
+				if (swappableStats[statID] === maxValue) {
+					modStats[statID] = minValue;
+				} else if (swappableStats[statID] === minValue) {
+					modStats[statID] = maxValue;
+				} else {
+					modStats[statID] = swappableStats[statID];
+				}
+			}
+			this.modData('Pokedex', battleAltFormes[i]).baseStats = modStats;
+		}
+	}
+};