update

src/app/filter-pokemon--pipe.pipe.ts

@@ -1,7 +1,7 @@
 import { Pipe, PipeTransform } from '@angular/core';
 
 @Pipe({
-  name: 'filterPokemonPipe'
+  name: 'filterPokemonPipe', pure: false
 })
 export class FilterPokemonPipePipe implements PipeTransform {
 
@@ -16,6 +16,6 @@ export class FilterPokemonPipePipe implements PipeTransform {
     } else {
       return [];
     }
-  }
+  }  
 
 }