ExtraNicc

Hello, so I've come across an oddity in playing Pokemon Pearl. I've had this for a while, but since I messed with the save data externally a lot, I assumed it had to do with that. But upon resetting the file and grabbing the explorers kit, the same thing happened. The issue is, whenever I use the explorer's kit, I can descend into the underground just fine. However, upon ascension, the game will freeze on the white screen, unable to do anything until I turn on and off the device again. Is there a reason why this is occurring, and more importantly, any way to fix it? Feel free to ask for more details and I'll try to answer accordingly. Thank you in advance,

I apologize for reposting the same content, but Ive been dealing with this issue and I dont have a fix yet Okay, so I want to reset my Heatran in Pokemon Pearl so I can eventually shiny hunt and/or RNG for good stats. The issue is, I'm not sure how to. I tried a few things regarding event flags but then two issues popped up. 1: Heatran will not reappear. No matter what flags I have on or off Heatran is always gone. 2. Trainers that would have level ~60 mons no longer have those high level pokemon and money distribution. Changing the flags on Heatran will not fix this for some reason. So is there any way to get rid of these issues? If not the first one, I would at least like to get the second one fixed. Thanks for your time in advance.