fix

Author: DieterReinert

play.pokemonshowdown.com/src/battle-dex.ts

@@ -823,7 +823,7 @@ const Dex = new class implements ModdedDex {
 			spriteid = species.spriteid || toID(pokemon.species);
 		}
 		// if it doesn't exist then add it so you don't get a broken image lol it's a custom client you can easily add the image
-		if (species.num <= 0 || species.name.endsWith('megag')) {
+		if (species.num <= 0 || species.id.endsWith('megag')) {
 			return {
 				spriteDir: 'sprites/custom', spriteid, x: 15, y: 15, isCustom: true,
 			};