Hello Darshil
you can pass context from button and then based on that context you can hide or show create button with fields_view_get method.
Example:
@api.model
def fields_view_get(self, view_id=None, view_type='form',
                    toolbar=False, submenu=False):
    ret_val = super(TreatmentExtended, self).fields_view_get(
        view_id=view_id, view_type=view_type,
        toolbar=toolbar, submenu=submenu)
    if self._context.get('your context') and view_type == 'form' and view_id='your view id':
        doc = etree.XML(ret_val['arch'])
        for node in doc.xpath("//form"):
            node.set('create','true')
        ret_val['arch'] = etree.tostring(doc)
    return ret_val