diff --git a/src/ui/pokedex-ui-handler.ts b/src/ui/pokedex-ui-handler.ts
index aa2a5cda459..6a6afea9798 100644
--- a/src/ui/pokedex-ui-handler.ts
+++ b/src/ui/pokedex-ui-handler.ts
@@ -410,6 +410,11 @@ export class PokedexUiHandler extends MessageUiHandler {
       new DropDownLabel(i18next.t("filterBar:hasHiddenAbility"), undefined, DropDownState.ON),
       new DropDownLabel(i18next.t("filterBar:noHiddenAbility"), undefined, DropDownState.EXCLUDE),
     ];
+    const seenSpeciesLabels = [
+      new DropDownLabel(i18next.t("filterBar:seenSpecies"), undefined, DropDownState.OFF),
+      new DropDownLabel(i18next.t("filterBar:isSeen"), undefined, DropDownState.ON),
+      new DropDownLabel(i18next.t("filterBar:isUnseen"), undefined, DropDownState.EXCLUDE),
+    ];
     const eggLabels = [
       new DropDownLabel(i18next.t("filterBar:egg"), undefined, DropDownState.OFF),
       new DropDownLabel(i18next.t("filterBar:eggPurchasable"), undefined, DropDownState.ON),
@@ -423,6 +428,7 @@ export class PokedexUiHandler extends MessageUiHandler {
       new DropDownOption("FAVORITE", favoriteLabels),
       new DropDownOption("WIN", winLabels),
       new DropDownOption("HIDDEN_ABILITY", hiddenAbilityLabels),
+      new DropDownOption("SEEN_SPECIES", seenSpeciesLabels),
       new DropDownOption("EGG", eggLabels),
       new DropDownOption("POKERUS", pokerusLabels),
     ];
@@ -792,13 +798,15 @@ export class PokedexUiHandler extends MessageUiHandler {
     this.starterSelectMessageBoxContainer.setVisible(!!text?.length);
   }
 
-  isSeen(species: PokemonSpecies, dexEntry: DexEntry): boolean {
+  isSeen(species: PokemonSpecies, dexEntry: DexEntry, seenFilter?: boolean): boolean {
     if (dexEntry?.seenAttr) {
       return true;
     }
-
-    const starterDexEntry = globalScene.gameData.dexData[this.getStarterSpeciesId(species.speciesId)];
-    return !!starterDexEntry?.caughtAttr;
+    if (!seenFilter) {
+      const starterDexEntry = globalScene.gameData.dexData[this.getStarterSpeciesId(species.speciesId)];
+      return !!starterDexEntry?.caughtAttr;
+    }
+    return false;
   }
 
   /**
@@ -1617,6 +1625,21 @@ export class PokedexUiHandler extends MessageUiHandler {
         }
       });
 
+      // Seen Filter
+      const dexEntry = globalScene.gameData.dexData[species.speciesId];
+      const isItSeen = this.isSeen(species, dexEntry, true);
+      const fitsSeen = this.filterBar.getVals(DropDownColumn.MISC).some(misc => {
+        if (misc.val === "SEEN_SPECIES" && misc.state === DropDownState.ON) {
+          return isItSeen;
+        }
+        if (misc.val === "SEEN_SPECIES" && misc.state === DropDownState.EXCLUDE) {
+          return !isItSeen;
+        }
+        if (misc.val === "SEEN_SPECIES" && misc.state === DropDownState.OFF) {
+          return true;
+        }
+      });
+
       // Egg Purchasable Filter
       const isEggPurchasable = this.isSameSpeciesEggAvailable(species.speciesId);
       const fitsEgg = this.filterBar.getVals(DropDownColumn.MISC).some(misc => {
@@ -1658,6 +1681,7 @@ export class PokedexUiHandler extends MessageUiHandler {
         fitsFavorite &&
         fitsWin &&
         fitsHA &&
+        fitsSeen &&
         fitsEgg &&
         fitsPokerus
       ) {