diff --git a/src/data.js b/src/data.js
index 214e5603..c17342b0 100644
--- a/src/data.js
+++ b/src/data.js
@@ -12,11 +12,81 @@ export function filtradoWeakness(valor) {
   return pkmWeak;
 }
 
-/* export function filterStrength(valor) {
-  if(valor === '')
-  const pkmWeak = POKEMON.filter((pkm) => (pkm.weaknesses.includes(valor)));
-  return pkmWeak;
-} */
+export function filterStrength(valor) {
+  if (valor === 'Grass') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Flying' || 'Fire' || 'Ice' || 'Bug' || 'Poison')));
+    return pkmStg;
+  }
+  if (valor === 'Poison') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Psychic' || 'Ground')));
+    return pkmStg;
+  }
+  if (valor === 'Fire') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Ground' || 'water' || 'Rock')));
+    return pkmStg;
+  }
+  if (valor === 'Ice') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Fighting' || 'Rock' || 'Steel' || 'Fire')));
+    return pkmStg;
+  }
+  if (valor === 'Flying') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Rock' || 'Ice' || 'Electric')));
+    return pkmStg;
+  }
+  if (valor === 'Psychic') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Bug' || 'Ghost' || 'Dark')));
+    return pkmStg;
+  }
+  if (valor === 'Water') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Grass' || 'Electric')));
+    return pkmStg;
+  }
+  if (valor === 'Ground') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Water' || 'Grass' || 'Ice')));
+    return pkmStg;
+  }
+  if (valor === 'Rock') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Water' || 'Grass' || 'Steel' || 'Fighting' || 'Ground')));
+    return pkmStg;
+  }
+  if (valor === 'Electric') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Ground')));
+    return pkmStg;
+  }
+  if (valor === 'Bug') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Flying' || 'Fire' || 'Rock')));
+    return pkmStg;
+  }
+  if (valor === 'Normal') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Fighting')));
+    return pkmStg;
+  }
+  if (valor === 'Fighting') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Flying' || 'Psychic' || 'Fairy')));
+    return pkmStg;
+  }
+  if (valor === 'Ghost') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Ghost' || 'Dark')));
+    return pkmStg;
+  }
+  if (valor === 'Dark') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Fighting' || 'Bug' || 'Fairy')));
+    return pkmStg;
+  }
+  if (valor === 'Steel') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Ground' || 'Fighting')));
+    return pkmStg;
+  }
+  if (valor === 'Dragon') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Dragon' || 'Fairy' || 'Ice')));
+    return pkmStg;
+  }
+  if (valor === 'Fairy') {
+    const pkmStg = POKEMON.filter((pkm) => (pkm.type.includes('Poison' || 'Steel')));
+    return pkmStg;
+  }
+  return filterStrength;
+}
 
 // sort by numero decreciente
 export function sortBy(dato) {
@@ -25,18 +95,18 @@ export function sortBy(dato) {
     return numOrder;
   }
   if (dato === 'aToZ') {
-    const azOrder = POKEMON.sort((a, b) => {
+    POKEMON.sort((a, b) => {
       if (a.name < b.name) { return -1; }
       if (a.name > b.name) { return 1; }
-      return azOrder;
+      return sortBy;
     });
   }
   if (dato === 'ZtoA') {
-    const zaOrder = POKEMON.sort((a, b) => {
+    POKEMON.sort((a, b) => {
       if (b.name < a.name) { return -1; }
       if (b.name > a.name) { return 1; }
-      return zaOrder;
+      return sortBy;
     });
   }
-
+  return sortBy;
 }
diff --git a/src/main.js b/src/main.js
index a1f63f69..1b586fbf 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,5 +1,7 @@
 import POKEMON from './data/pokemon/pokemon.js';
-import { filtradoTypo, filtradoWeakness, sortBy } from './data.js';
+import {
+  filtradoTypo, filtradoWeakness, filterStrength, sortBy,
+} from './data.js';
 
 /* muestra los objetos */
 const main = document.getElementById('all');
@@ -7,7 +9,7 @@ const overlay = document.getElementById('overlay');
 const fortaleza = ['Ground', 'Rock', 'water'];
 
 function createCard(data) {
-  for (let i = 0; i < data.length; i + 1) {
+  for (let i = 0; i < data.length; i += 1) {
     const newBtn = document.createElement('button');
     newBtn.setAttribute('class', 'indPkm');
     newBtn.setAttribute('name', data[i].name);
@@ -32,7 +34,7 @@ function createCard(data) {
 createCard(POKEMON);
 
 function createOverCard(data) {
-  for (let i = 0; i < data.length; i + 1) {
+  for (let i = 0; i < data.length; i += 1) {
     const divOne = document.createElement('div');
     divOne.setAttribute('class', 'contImg');
     divOne.setAttribute('id', data[i].id);
@@ -83,7 +85,7 @@ document.querySelectorAll('.typeOption button').forEach((elemento) => {
   });
 });
 
-// Filtrado por Debilidad
+// Filtrado "Debil contra"
 
 document.querySelectorAll('.typeWeakness button').forEach((elemento) => {
   elemento.addEventListener('click', () => {
@@ -94,6 +96,17 @@ document.querySelectorAll('.typeWeakness button').forEach((elemento) => {
   });
 });
 
+// filtrado "Fuerte contra"
+
+document.querySelectorAll('.typeStrength button').forEach((elemento) => {
+  elemento.addEventListener('click', () => {
+    const valor = elemento.value;
+    main.innerHTML = '';
+    const pkmStg = filterStrength(valor);
+    createCard(pkmStg);
+  });
+});
+
 // listener para las imagenes para overlay
 document.querySelectorAll('#all .indPkm').forEach((elemento) => {
   elemento.addEventListener('click', () => {
diff --git a/test/data.spec.js b/test/data.spec.js
index b5ad8093..43081247 100644
--- a/test/data.spec.js
+++ b/test/data.spec.js
@@ -44,9 +44,9 @@ describe('data-lover', () => {
       sortBy('aToZ');
       expect(POKEMON[4].name).toBe('Arcanine');
     });
-    it('debería retornar "Ratata" para sortPkm[35].name con Orden de la Z a la A', () => {
+    it('debería retornar "Rattata" para sortPkm[35].name con Orden de la Z a la A', () => {
       sortBy('ZtoA');
-      expect(POKEMON[35].name).toBe('Ratata');
+      expect(POKEMON[35].name).toBe('Rattata');
     });
   });
 });