Movie Wars Megamax (this is gonna be long and very fanficcy so please take it easy on me):
[HIDE]First and foremost, Double doesn't appear. While Shotaro makes a quick voice cameo, he and Phillip are never actually onscreen. Instead, their part is filled by the five protagonists from Smile Pretty Cure, with Yayoi/Cure Peace having the most focus.
The third part of the movie starts with Yayoi arriving in Fuuto through the Mysterious Library after hearing about the meteor and Foundation X's plans. Being the tokusatsu fanatic she is, she doesn't hesitate looking for them, but they are the ones that find her. After thinking about what Shotaro would do in her position, Yayoi transforms into Cure Peace and fights the Kamakiri and Kabuto Yummies, but much like in canon her interference (and clumsiness) causes the SOLU sample to leak away, and Yayoi, noticing this, heads to the Narumi Detective Agency to tell Shotaro and Phillip about this, despite having never really met them.
During the Fourze part, right after the brief "love at first sight" moment between Gentaro and Nadeshiko, we go back to Fuuto, where Miyuki, Akane, Nao, Reika and Candy are looking for Yayoi until they find her shedding tears while facing the entrance of the Narumi Detective Agency; it turns out that Shotaro and Phillip aren't around, as Akiko took them with her on a trip to Osaka, which is pointed out by a note pinned to the door. Akane quickly recognizes the name "Narumi Akiko" and reveals that she and Akiko are close friends, and she has kept Akiko's cellphone number. This info comes in handy for Yayoi, who uses the phone number to contact Shotaro about the whole thing involving Foundation X, and Shotaro advises her to go after it herself. After that, we cut to the scene with the KRC and Nadeshiko in the infirmary, continuing her storyline from where it stopped.
The final part begins with Eiji and Gentaro meeting up with the Smile Cures, with Yayoi having a brief fangasm and hitting it off with Gentaro (in a much friendlier way than the Shotaro/Gentaro scene in canon) before telling them what she knows about Foundation X. After that, the scene goes like the canon version, but with the Smile Cures replacing Double, until a certain point where Fourze finds the Rider-themed items, which, in this version, are not Medals and Switches but rather special Cure Décors, which, when used by the Cures, allow the spirits of the Seven Legendary Riders to possess them and fight in their bodies.
Finally, during the epilogue, instead of the scene with Gentaro and the real Nadeshiko, we get a scene involving Gentaro and the Smile Cures placing the Rider Décors in the Décor Décolle, which causes the Seven Legendary Riders to be restored to their original forms. After a brief conversation between Cures and Riders, an overly-excited Yayoi asks the Seven Legendary Riders to sign a blank page of her sketchbook, which they do, causing Yayoi to faint only to be caught by Gentaro in a similar way to how he caught Nadeshiko earlier.[/HIDE]