@Epithet Hello Maam/Sir, thank you so much for your reply and I appreciate it.
Maybe I got it what you have said. The situation is, I already defeat elite 4, I also defeated the 8th gym leaders in Johto and Kanto, now I am currently stand by in Kanto and back in Johto and ofcourse my previous team from Kanto will lock and now I'm here in Johoto to beat the gym leaders so that I can unlock my prevoius team. But my problem is, the 8th gym leaders I already fight them but I won 5 from the gym leaders out of 8. Then I cannot fight them back, and when I check my PC, my prevoius teams are not back. What should I do? Thank you for your help.