I adjusted the thread title to better address your question.
"All Riders vs. Dai-Shocker" is a movie tie-in to the series, to explain Tsukasa's origins and where the DecadeDriver and DienDriver came from. The ending to the series plotline is part of the double feature with Kamen Rider Double, entitled "Decade vs. All Riders". We won't get a chance to see that until it comes out on DVD in May.
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