Flash movies are a great way to add multimedia elements to a web site. Unfortunately, Flash cannot be indexed by most search engines. For that reason, it is very difficult to get high search engine rankings for Flash sites.
Even Google officially tells webmasters that it is difficult to get ranked with Flash sites: "If fancy features such as JavaScript, cookies, session IDs, frames, DHTML, or Flash keep you from seeing all of your site in a [simple] text browser, then search engine spiders may have trouble crawling your site."