<?php
/*
Template Name: Template Lister
*/
?>

<?php
$pages = get_pages(array(
	'meta_key' => '_wp_page_template',
	'meta_value' => 'page-subbrand.php'
));
if(!empty($pages))
{
    foreach($pages as $page){
	echo $page->post_title.'<br />';
    }
}

?>