From b0bf31074a42da9bf4e96047d5164a94f24591b1 Mon Sep 17 00:00:00 2001
From: Kris Johnson <11083252+KrisXV@users.noreply.github.com>
Date: Thu, 1 May 2025 10:27:53 -0600
Subject: [PATCH] Fix old gens LC teambuilder

---
 build-tools/build-indexes | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/build-tools/build-indexes b/build-tools/build-indexes
index 112405f8d..b1694819b 100755
--- a/build-tools/build-indexes
+++ b/build-tools/build-indexes
@@ -412,7 +412,8 @@ process.stdout.write("Building `data/teambuilder-tables.js`... ");
 					let tier = species.tier;
 					const lc = Dex.formats.get(gen + 'lc');
 					const lcBanlist = Dex.formats.getRuleTable(lc);
-					if (!species.nfe || species.prevo || lcBanlist.isBannedSpecies(species)) {
+					const prevoSpecies = Dex.mod(gen).species.get(species.prevo);
+					if (!species.nfe || (prevoSpecies.exists && prevoSpecies.gen <= genNum) || lcBanlist.isBannedSpecies(species)) {
 						tier = 'Illegal';
 					}
 					if (/^([OURNPZ]U(BL)?|Uber|AG)$/g.test(tier) && tier !== 'Illegal') {