Code for calling some phtml file into view.phtml file or on cms page in magento 1
<?php echo $this->getLayout()->createBlock('core/template')->setTemplate('catalog/product/list/mostviewedproducts.phtml')->toHtml(); ?>
Code For Calling The Template File In Some CMS Page Or In Static Block
{{block type="core/template" template="product/hello.phtml"}}