Add NPA mode

Author: mia-pi-git

Diff for: play.pokemonshowdown.com/src/battle-animations.ts

@@ -568,15 +568,18 @@ export class BattleScene implements BattleSceneStub {
 		this.gen = gen;
 		this.activeCount = this.battle.nearSide?.active.length || 1;
 
-		const isSPL = (typeof this.battle.rated === 'string' && this.battle.rated.startsWith("Smogon Premier League"));
+		const rated = this.battle.rated;
 		let bg: string;
-		if (isSPL) {
+		if (typeof rated === 'string' && rated.startsWith("Smogon Premier League")) {
 			if (gen <= 1) bg = 'fx/bg-gen1-spl.png';
 			else if (gen <= 2) bg = 'fx/bg-gen2-spl.png';
 			else if (gen <= 3) bg = 'fx/bg-gen3-spl.png';
 			else if (gen <= 4) bg = 'fx/bg-gen4-spl.png';
 			else bg = 'fx/bg-spl.png';
 			this.setBgm(-101);
+		} else if (typeof rated === 'string' && rated.startsWith('National Pokemon Association')) {
+			bg = 'fx/bg-npa.png';
+			this.setBgm(-101);
 		} else {
 			if (gen <= 1) bg = 'fx/bg-gen1.png?';
 			else if (gen <= 2) bg = 'fx/bg-gen2.png?';
@@ -586,6 +589,7 @@ export class BattleScene implements BattleSceneStub {
 			else bg = `sprites/gen6bgs/${BattleBackdrops[this.numericId % BattleBackdrops.length]}`;
 		}
 
+		console.log(bg);
 		this.backdropImage = bg;
 		if (this.$bg) {
 			this.$bg.css('background-image', `url(${Dex.resourcePrefix}${this.backdropImage})`);