One Week Earlier

Future Calem was worried Furutre Serena should be back now after "convincing" present-day Serena (Who I'll be referring to Serena BTW) Calem knew that the goal was to have it so that they still get married so he decided to do something the failsafe...

He went to the time travel pod said goodbye to Clemont and was in the present he saw his old home in Kanto and decided to go talk to present-day Calem (Who I'll be referring to as Camel in the prologue)

Future Calem rang the doorbell and Camel answered. "What you're from the future?" Camel said seeing the similarities between them the way they dressed, and looked was basically an indicator that this was Future Calem.

"Calem I need you to listen to me you marry a beautiful girl in the future," Future Calem said showing Camel a picture and Camel starts drooling, "But the present-day version of her is causing some problems now I know they'll be coming to Kanto you'll go under the false name Ethan and start dating Serena so that things remain relatively normal" Future Calem continued. 

"I understand," Camel said. "Good it seems that you want to cooperate unlike Serena well bye," Future Calem said while getting into the pod and then the pod disappeared to the future.