With Kamen Rider DiEnd's acquisition of his Complete Form, like Kamen Rider Decade Complete, he's been able to summon fellow Riders. But compared to Decade Complete who summons main Heisei Kamen Riders, he can summon Evil (not necessarily) Movie Exclusive Kamen Riders.
Kamen Rider DiEnd Complete form will debut in Kamen Rider x Kamen Rider x Kamen Rider The Movie: Chou Den-O Trilogy, Episode Yellow: Treasure Di End Pirates. DiEnd will be summoning the following Kamen Riders:
Fans of Kimito Totani aka Daiki Kaito will also see him being possessed by Imagins, Urataros to be precise. >< 
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Its G4, Geki. Skull is not actually evil.
No evil Den-O Movie Riders? Honestly, it would make more sense than Skull, even though he does look evil.
@Phantom
Well, we haven't really known the reason why there's no Den-O Movie Exclusive rider. It could have been better if there's Gaoh or Yuuki.
i think the reason why there is no "evil/other Den-O" rider in there cause the face that it IS a Den-O trilogy movie.
oh well... at least we have something to watch again.
-Kurenai™-