Drupal 7 custom block not showing in block list
That is because your module_block_view() function is not written properly. the content is not passed into any of the blocks you defined in your module_block_info()

function bloque_buscador_block_view($delta = '')
{
        $block = array();
        switch ($delta) 
       {
        case 'bloque_home':
            $block['subject'] = t('Syndicate');
            $block['content'] = YOUR CONTENT IN HERE,

        );
        break;
        case 'bloque_sidebar':
            $block['subject'] = t('Syndicate');
            $block['content'] = YOUR CONTENT IN HERE,

        );
        break;
      }
    return block;
 }