National Dex RU: Ban Mienshao to RUBL (smogon#10442)

https://www.smogon.com/forums/threads/national-dex-ru-metagame-discussion.3713801/post-10202214

Author: Runoisch

data/formats-data.ts

@@ -3511,7 +3511,7 @@ export const FormatsData: import('../sim/dex-species').SpeciesFormatsDataTable =
 	mienshao: {
 		tier: "NU",
 		doublesTier: "(DUU)",
-		natDexTier: "RU",
+		natDexTier: "RUBL",
 	},
 	druddigon: {
 		isNonstandard: "Past",