From f52bc482bb43057f6566a55cb0e10adca7b179b0 Mon Sep 17 00:00:00 2001
From: Kris Johnson <11083252+KrisXV@users.noreply.github.com>
Date: Wed, 1 Oct 2025 21:13:50 -0600
Subject: [PATCH] Add Terastal Crescendo online competition (#11471)

* Add Terastal Crescendo online competition

* Fix build
---
 config/formats.ts |  8 ++++++++
 data/rulesets.ts  | 14 +++++++++-----
 sim/side.ts       | 11 ++++++-----
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/config/formats.ts b/config/formats.ts
index e791d1e392..7b512ee950 100644
--- a/config/formats.ts
+++ b/config/formats.ts
@@ -272,6 +272,14 @@ export const Formats: import('../sim/dex-formats').FormatList = [
 		ruleset: ['Flat Rules', '!! Adjust Level = 50', 'Min Source Gen = 9', 'VGC Timer', 'Force Open Team Sheets', 'Best of = 3', 'Limit Two Restricted'],
 		restricted: ['Restricted Legendary', 'Mythical'],
 	},
+	{
+		name: "[Gen 9] Terastal Crescendo",
+		mod: 'gen9',
+		gameType: 'doubles',
+		ruleset: ['Flat Rules', '!! Picked Team Size = 2', 'Min Team Size = 4', '!! Adjust Level = 50', 'Min Source Gen = 9', 'VGC Timer', 'Limit One Restricted', 'Force Select = Koraidon | Miraidon'],
+		unbanlist: ['Koraidon', 'Miraidon'],
+		restricted: ['Koraidon', 'Miraidon'],
+	},
 	{
 		name: "[Gen 9] Doubles Custom Game",
 		mod: 'gen9',
diff --git a/data/rulesets.ts b/data/rulesets.ts
index 1e43f0b63d..eeabd803f4 100644
--- a/data/rulesets.ts
+++ b/data/rulesets.ts
@@ -566,22 +566,26 @@ export const Rulesets: import('../sim/dex-formats').FormatDataTable = {
 	forceselect: {
 		effectType: 'ValidatorRule',
 		name: 'Force Select',
-		desc: `Forces a Pokemon to be on the team and selected at Team Preview. Usage: Force Select = [Pokemon], e.g. "Force Select = Magikarp"`,
+		desc: `Forces a Pokemon to be on the team and selected at Team Preview. Usage: Force Select = [Pokemon], e.g. "Force Select = Magikarp" or "Force Select = Koraidon | Miraidon"`,
 		hasValue: true,
 		onValidateRule(value) {
-			if (!this.dex.species.get(value).exists) throw new Error(`Misspelled Pokemon "${value}"`);
+			const values = value.split('|');
+			if (values.some(v => !this.dex.species.get(v).exists)) throw new Error(`Misspelled Pokemon provided in "${value}"`);
 		},
 		onValidateTeam(team) {
 			let hasSelection = false;
-			const species = this.dex.species.get(this.ruleTable.valueRules.get('forceselect'));
+			const speciesNameList = this.ruleTable.valueRules.get('forceselect')!.split('|')
+				.map(value => this.dex.species.get(value).name);
 			for (const set of team) {
-				if (species.name === set.species) {
+				if (speciesNameList.includes(set.species)) {
 					hasSelection = true;
 					break;
 				}
 			}
 			if (!hasSelection) {
-				return [`Your team must contain ${species.name}.`];
+				return [
+					`Your team must contain ${speciesNameList.length > 1 ? `one of: ${speciesNameList.join(', ')}` : speciesNameList[0]}.`,
+				];
 			}
 		},
 		// hardcoded in sim/side
diff --git a/sim/side.ts b/sim/side.ts
index 643c884bcb..13fda89134 100644
--- a/sim/side.ts
+++ b/sim/side.ts
@@ -1023,22 +1023,23 @@ export class Side {
 			}
 		}
 		if (ruleTable.valueRules.has('forceselect')) {
-			const species = this.battle.dex.species.get(ruleTable.valueRules.get('forceselect'));
+			const speciesList = ruleTable.valueRules.get('forceselect')!.split('|')
+				.map(entry => this.battle.dex.species.get(entry).name);
 			if (!data) {
 				// autoChoose
-				positions = [...this.pokemon.keys()].filter(pos => this.pokemon[pos].species.name === species.name)
-					.concat([...this.pokemon.keys()].filter(pos => this.pokemon[pos].species.name !== species.name))
+				positions = [...this.pokemon.keys()].filter(pos => speciesList.includes(this.pokemon[pos].species.name))
+					.concat([...this.pokemon.keys()].filter(pos => !speciesList.includes(this.pokemon[pos].species.name)))
 					.slice(0, pickedTeamSize);
 			} else {
 				let hasSelection = false;
 				for (const pos of positions) {
-					if (this.pokemon[pos].species.name === species.name) {
+					if (speciesList.includes(this.pokemon[pos].species.name)) {
 						hasSelection = true;
 						break;
 					}
 				}
 				if (!hasSelection) {
-					return this.emitChoiceError(`You must bring ${species.name} to the battle.`);
+					return this.emitChoiceError(`You must bring ${speciesList.length > 1 ? `one of ${speciesList.join(', ')}` : speciesList[0]} to the battle.`);
 				}
 			}
 		}