diff --git a/scripts/build-snapshot.mjs b/scripts/build-snapshot.mjs
index 743dec2..6645359 100644
--- a/scripts/build-snapshot.mjs
+++ b/scripts/build-snapshot.mjs
@@ -192,9 +192,8 @@ async function main() {
     };
   };
   const bstOf = (st) => st.hp + st.atk + st.def + st.spa + st.spd + st.spe;
-  const sameShape = (a, b) =>
-    a.types.join() === b.types.join() && a.bst === b.bst &&
-    a.stats.hp === b.stats.hp && a.stats.spe === b.stats.spe && a.stats.atk === b.stats.atk;
+  const abilKey = (pk) => pk.abilities.map((a) => a.ability.name).sort().join(',');
+  const statKey = (st) => `${st.hp}/${st.atk}/${st.def}/${st.spa}/${st.spd}/${st.spe}`;
 
   console.log(`Fetching ${ids.length} species (stats, typings, flags, forms) …`);
   const species = await mapLimit(ids, CONCURRENCY, async (id) => {
@@ -204,6 +203,8 @@ async function main() {
     ]);
     const stats = statMap(pk);
     const baseTypes = pk.types.slice().sort((a, b) => a.slot - b.slot).map((t) => t.type.name);
+    const baseAbil = abilKey(pk);
+    const baseStatKey = statKey(stats);
 
     // Non-default varieties = forms (megas, G-max, regional, alt formes).
     const variantSlugs = (sp.varieties || [])
@@ -231,10 +232,14 @@ async function main() {
         height: fp.height,
         weight: fp.weight,
       };
-      // Drop purely-cosmetic forms (identical stats & typing, no named category).
-      if (cat === 'other' && sameShape(entry, { types: baseTypes, bst: bstOf(stats), stats })) {
-        continue;
-      }
+      // Drop purely-cosmetic forms: same typing, stats AND abilities as the
+      // base, and not a named category (mega/gmax/regional/primal).
+      const cosmetic =
+        cat === 'other' &&
+        ftypes.join() === baseTypes.join() &&
+        statKey(fstats) === baseStatKey &&
+        abilKey(fp) === baseAbil;
+      if (cosmetic) continue;
       forms.push(entry);
     }