diff --git a/build-tools/build-indexes b/build-tools/build-indexes
index b1694819b..de1561718 100755
--- a/build-tools/build-indexes
+++ b/build-tools/build-indexes
@@ -327,7 +327,7 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 	const LC = GENS.map(num => num + 0.7);
 	const STADIUM = [2.04, 1.04];
 	const NATDEX = [9.1, 8.1];
-	const OTHER = [9.9, 9.6, 9.411, 9.41, 9.401, 9.4, 9.2, -9.4, -9.401, 8.6, 8.4, 8.2, 8.1, -8.4, -8.6, 7.1, 5.1];
+	const OTHER = [9.9, 9.6, 9.411, 9.41, 9.401, 9.4, 9.2, -9.4, -9.401, 8.6, 8.4, 8.2, 8.1, -8.4, -8.6, 7.1, 5.1, 3.1];
 
 	// process.stdout.write("\n  ");
 	for (const genIdent of [...GENS, ...DOUBLES, ...VGC, ...NFE, ...STADIUM, ...OTHER, ...NATDEX, ...LC]) {
@@ -347,6 +347,7 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 		const isSSB = genIdent === 9.6;
 		const genNum = Math.floor(isDoubles ? -genIdent : genIdent);
 		const isBW1 = genIdent === 5.1;
+		const isRS = genIdent === 3.1;
 		const gen = (() => {
 			let genStr = 'gen' + genNum;
 			if (isSSDLC1) genStr += 'dlc1';
@@ -357,6 +358,7 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 			if (isStadium) genStr += 'stadium' + (genNum > 1 ? genNum : '');
 			if (isSSB) genStr += 'ssb';
 			if (isBW1) genStr += 'bw1';
+			if (isRS) genStr += 'rs';
 			return genStr;
 		})();
 		// process.stdout.write("" + gen + (isDoubles ? " doubles" : "") + "... ");
@@ -436,6 +438,18 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 					if (species.tier === 'LC') return 'LC';
 					return 'Regular';
 				}
+				if (isRS) {
+					if (species.isNonstandard) {
+						if (species.isNonstandard === 'Unobtainable') return 'Unreleased';
+						return 'Illegal';
+					}
+					if (species.tier === 'Uber') return 'Uber';
+					if (species.nfe) {
+						if (species.prevo.length === 0) return "LC";
+						return "NFE";
+					}
+					return "Regular";
+				}
 				if (isGen9BH) {
 					if ((species.natDexTier === 'Illegal' || species.forme.includes('Totem')) &&
 						!['Floette-Eternal', 'Greninja-Ash', 'Xerneas-Neutral'].includes(species.name)) {
@@ -581,7 +595,7 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 			BattleTeambuilderTable.ubersUUBans = ubersUUBans;
 			BattleTeambuilderTable.monotypeBans = monotypeBans;
 			BattleTeambuilderTable.formatSlices = formatSlices;
-		} else if (isBW1) {
+		} else if (isBW1 || isRS) {
 			BattleTeambuilderTable[gen] = {};
 			BattleTeambuilderTable[gen].overrideTier = overrideTier;
 			BattleTeambuilderTable[gen].tiers = tiers;
@@ -611,6 +625,9 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 			if (isVGC || isGen9BH) {
 				return ["Mythical", "Restricted Legendary", "Regular", "NFE", "LC"];
 			}
+			if (isRS) {
+				return ["Regular", "NFE", "LC", "Uber"];
+			}
 			if (isDoubles && genNum > 4) {
 				return ["DUber", "(DUber)", "DOU", "DBL", "(DOU)", "DUU", "(DUU)", "New", "NFE", "LC"];
 			}
@@ -988,6 +1005,16 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 			if (minGen === 1) learnsets[id][moveid] = '12' + learnsets[id][moveid];
 		}
 	}
+	const G3RSLearnsets = Dex.mod('gen3rs').data.Learnsets;
+	for (const id in G3RSLearnsets) {
+		const species = Dex.mod('gen3rs').species.get(id);
+		if (species.isNonstandard && !['Unobtainable', 'CAP'].includes(species.isNonstandard)) continue;
+		const learnset = G3RSLearnsets[id].learnset;
+		BattleTeambuilderTable['gen3rs'].learnsets[id] = {};
+		for (const moveid in learnset) {
+			BattleTeambuilderTable['gen3rs'].learnsets[id][moveid] = '3';
+		}
+	}
 	const G5BW1Learnsets = Dex.mod('gen5bw1').data.Learnsets;
 	for (const id in G5BW1Learnsets) {
 		const species = Dex.mod('gen5bw1').species.get(id);
@@ -1253,7 +1280,7 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 	// Mods
 	//
 
-	for (const mod of ['gen5bw1', 'gen7letsgo', 'gen8bdsp', 'gen9ssb']) {
+	for (const mod of ['gen3rs', 'gen5bw1', 'gen7letsgo', 'gen8bdsp', 'gen9ssb']) {
 		const modDex = Dex.mod(mod);
 		const modData = modDex.data;
 		const parentDex = Dex.forGen(modDex.gen);
diff --git a/play.pokemonshowdown.com/src/battle-dex-search.ts b/play.pokemonshowdown.com/src/battle-dex-search.ts
index a71a146a2..2ee743e2b 100644
--- a/play.pokemonshowdown.com/src/battle-dex-search.ts
+++ b/play.pokemonshowdown.com/src/battle-dex-search.ts
@@ -551,7 +551,7 @@ abstract class BattleTypedSearch<T extends SearchType> {
 	 */
 	set: Dex.PokemonSet | null = null;
 
-	protected formatType: 'doubles' | 'bdsp' | 'bdspdoubles' | 'bw1' | 'letsgo' | 'metronome' | 'natdex' | 'nfe' |
+	protected formatType: 'doubles' | 'bdsp' | 'bdspdoubles' | 'rs' | 'bw1' | 'letsgo' | 'metronome' | 'natdex' | 'nfe' |
 		'ssdlc1' | 'ssdlc1doubles' | 'predlc' | 'predlcdoubles' | 'predlcnatdex' | 'svdlc1' | 'svdlc1doubles' |
 		'svdlc1natdex' | 'stadium' | 'lc' | null = null;
 
@@ -634,6 +634,10 @@ abstract class BattleTypedSearch<T extends SearchType> {
 			this.formatType = 'bw1';
 			this.dex = Dex.mod('gen5bw1' as ID);
 		}
+		if (format.includes('adv200')) {
+			this.formatType = 'rs';
+			this.dex = Dex.mod('gen3rs' as ID);
+		}
 		if (format === 'partnersincrime') this.formatType = 'doubles';
 		if (format.startsWith('ffa') || format === 'freeforall') this.formatType = 'doubles';
 		if (format.includes('letsgo')) {
@@ -755,6 +759,7 @@ abstract class BattleTypedSearch<T extends SearchType> {
 		if (this.formatType?.startsWith('bdsp')) table = table['gen8bdsp'];
 		if (this.formatType === 'letsgo') table = table['gen7letsgo'];
 		if (this.formatType === 'bw1') table = table['gen5bw1'];
+		if (this.formatType === 'rs') table = table['gen3rs'];
 		if (speciesid in table.learnsets) return speciesid;
 		const species = this.dex.species.get(speciesid);
 		if (!species.exists) return '' as ID;
@@ -823,6 +828,7 @@ abstract class BattleTypedSearch<T extends SearchType> {
 			if (this.formatType?.startsWith('bdsp')) table = table['gen8bdsp'];
 			if (this.formatType === 'letsgo') table = table['gen7letsgo'];
 			if (this.formatType === 'bw1') table = table['gen5bw1'];
+			if (this.formatType === 'rs') table = table['gen3rs'];
 			let learnset = table.learnsets[learnsetid];
 			const eggMovesOnly = this.eggMovesOnly(learnsetid, speciesid);
 			if (learnset && (moveid in learnset) && (!this.format.startsWith('tradebacks') ? learnset[moveid].includes(genChar) :
@@ -846,6 +852,7 @@ abstract class BattleTypedSearch<T extends SearchType> {
 			this.formatType === 'bdsp' ? 'gen8bdsp' :
 			this.formatType === 'bdspdoubles' ? 'gen8bdspdoubles' :
 			this.formatType === 'bw1' ? 'gen5bw1' :
+			this.formatType === 'rs' ? 'gen3rs' :
 			this.formatType === 'nfe' ? `gen${gen}nfe` :
 			this.formatType === 'lc' ? `gen${gen}lc` :
 			this.formatType === 'ssdlc1' ? 'gen8dlc1' :
@@ -981,6 +988,8 @@ class BattlePokemonSearch extends BattleTypedSearch<'pokemon'> {
 			table = table['gen7letsgo'];
 		} else if (this.formatType === 'bw1') {
 			table = table['gen5bw1'];
+		} else if (this.formatType === 'rs') {
+			table = table['gen3rs'];
 		} else if (this.formatType === 'natdex') {
 			table = table[`gen${dex.gen}natdex`];
 		} else if (this.formatType === 'metronome') {
@@ -1072,6 +1081,8 @@ class BattlePokemonSearch extends BattleTypedSearch<'pokemon'> {
 		else if (format === 'doublesnu') tierSet = tierSet.slice(slices.DNU || slices.DUU);
 		else if (this.formatType?.startsWith('bdsp') || this.formatType === 'letsgo' || this.formatType === 'stadium') {
 			tierSet = tierSet.slice(slices.Uber);
+		} else if (this.formatType === 'rs') {
+			tierSet = tierSet.slice(slices.Regular);
 		} else if (!isDoublesOrBS) {
 			tierSet = [
 				...tierSet.slice(slices.OU, slices.UU),
@@ -1283,6 +1294,8 @@ class BattleItemSearch extends BattleTypedSearch<'item'> {
 			table = table['gen8bdsp'];
 		} else if (this.formatType === 'bw1') {
 			table = table['gen5bw1'];
+		} else if (this.formatType === 'rs') {
+			table = table['gen3rs'];
 		} else if (this.formatType === 'natdex') {
 			table = table[`gen${this.dex.gen}natdex`];
 		} else if (this.formatType?.endsWith('doubles')) { // no natdex/bdsp doubles support
@@ -1662,6 +1675,7 @@ class BattleMoveSearch extends BattleTypedSearch<'move'> {
 		if (this.formatType?.startsWith('bdsp')) lsetTable = lsetTable['gen8bdsp'];
 		if (this.formatType === 'letsgo') lsetTable = lsetTable['gen7letsgo'];
 		if (this.formatType === 'bw1') lsetTable = lsetTable['gen5bw1'];
+		if (this.formatType === 'rs') lsetTable = lsetTable['gen3rs'];
 		if (this.formatType?.startsWith('ssdlc1')) lsetTable = lsetTable['gen8dlc1'];
 		if (this.formatType?.startsWith('predlc')) lsetTable = lsetTable['gen9predlc'];
 		if (this.formatType?.startsWith('svdlc1')) lsetTable = lsetTable['gen9dlc1'];