diff --git a/src/data/ability.ts b/src/data/ability.ts
index 768dcd04b61..05b74ece6c8 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -1155,6 +1155,8 @@ export class PostSummonFormChangeAbAttr extends PostSummonAbAttr {
 export class TraceAbAttr extends PostSummonAbAttr {
   applyPostSummon(pokemon: Pokemon, passive: boolean, args: any[]): boolean {
     const targets = pokemon.getOpponents();
+    if (!targets.length)
+      return false;
     let target: Pokemon;
     if (targets.length > 1)
       pokemon.scene.executeWithSeedOffset(() => target = Utils.randSeedItem(targets), pokemon.scene.currentBattle.waveIndex);
diff --git a/src/data/move.ts b/src/data/move.ts
index bebbc3b21ae..dac1301b7f4 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -2828,16 +2828,16 @@ export class NaturePowerAttr extends OverrideMoveEffectAttr {
         case TerrainType.NONE:
           switch (user.scene.arena.biomeType) {
             case Biome.TOWN:
-              moveId = Moves.TRI_ATTACK;
+              moveId = Moves.ROUND;
               break;
             case Biome.METROPOLIS:
-              moveId = Moves.DARK_PULSE;
+              moveId = Moves.TRI_ATTACK;
               break;
             case Biome.SLUM:
               moveId = Moves.SLUDGE_BOMB;
               break;
             case Biome.PLAINS:
-              moveId = Moves.ROUND;
+              moveId = Moves.SILVER_WIND;
               break;
             case Biome.GRASS:
               moveId = Moves.GRASS_KNOT;