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So, I'm training for the Elite Four in my Pokémon Black game. Normally, you could rebattle the trainers at Big Stadium and Small Court, but at the time I am writing this post, there is a baseball game going on in Big Stadium, so I cannot go there to train. There is also the Rotation Battle House in Opelucid City. But, the problem is, whenever I go to the trainers in the two places I can, I'm unable to do so, despite having not rebattled the trainers once today. I tried soft-resetting for the Rotation Battle House, exiting and reentering Small Court, and I still cannot rebattle the trainers. By the way, I'm playing on DeSmuMe. What has happened and how can I fix the problem?

Edit: Big Stadium just opened up again and I rebattled all of the trainers there. However, I still can't battle the others in Small Court or Opelucid City.

Edit 2: It's a new day and the reverse is happening. I can battle trainers in Small Court now, but now I can't battle anyone in Big Stadium or Opelucid City.

Edit 3: I've made it to Undella Town, now I can't complete the Riches Challenge. Is it a problem with the emulator or what?

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    I don't think DeSmuME supports those games wiki.desmume.org/… – Angzuril Mar 26 '17 at 16:53
  • Aw, come on! The game works perfectly barring the rematches! – Obinna Nwakwue Mar 26 '17 at 21:16
  • Have you tried out an AR code for rebattling trainers yet? It will also give you the ability to rebattle about every trainer except the gym leaders, but you could try and see if you can do the Riches Challenge like that. – FFHannibal Mar 29 '17 at 7:36
  • I could try that, but I only want to use the AR code as a last resort. It could crash my game. Any other suggestions? – Obinna Nwakwue Mar 31 '17 at 22:23
  • Well, emulating with a ROM I downloaded from the internet is illegal (considering that this is of a Nintendo game), so.... – Obinna Nwakwue Apr 9 '17 at 19:23
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DeSmuME does not officially support the main series Pokemon Games:

Why can't I play Pokemon Diamond / Pearl / HeartGold / SoulSilver / Black / White? Why aren't they supported?

We are not going to support these games. Don't waste time asking, it will only make us angry. If you can't make it work, then give up and go buy the cart.
DeSmuME FAQ

While not the nicest way of putting it, it's a fair assessment. Emulators like DeSmuME are only 'pretending' to be the original DS hardware, and they may not support 100% of the games nor all the features of the DS.

It's also worth mentioning that the latest stable version of DeSmuME (as of writing) is 0.9.11 - it's still being actively worked on, and is not considered a finished product. There may still be bugs hidden away in the emulation code that are not immediately apparent but cause issues/glitches with games.

As an example - the emulator may not fully emulate the game's clock correctly, introducing errors into time-based events like the ones your seeing. Pokemon games are notorious for shutting down time events for 48 hours when they detect a change to the system clock (even for perfectly legitimate reasons like Daylight Savings changes). This functionality is built to prevent people cheating by changing the clock to speed up processes like berries growing, or trainers requesting rematches.


So what can you do?

To avoid most time-breaking issues, I would recommend not using Save states - only Save and Load using the in-game 'Save' function. Also avoid any 'fast-forward' features (if any). This should at least limit the impact of time glitches on your save game.

If the issues are still occurring after that, then you may have to look into other options such as purchasing a DS to play on (relatively cheap now in most second-hand electronics stores!), or finding another emulator that supports the Pokemon games better.

  • I don't use save states; I save my game with the in-game save option. But let me try what you said. Also, if DeSmuME doesn't support Pokémon Black or White, then Memory Link won't work on Black 2 or White 2, right? – Obinna Nwakwue Apr 8 '17 at 22:33
  • Well, I failed to find a working emulator (I couldn't execute the ROM on iDeaS nor on NeonDS, Black and white outright doesn't work on No$gba), so...is all hope lost for emulation? – Obinna Nwakwue Apr 9 '17 at 0:44
  • @Obinna I guess so, sorry. Best bet is to get a DS. they're pretty cheap now – Robotnik Apr 9 '17 at 23:19
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Big Stadium and Small Court close for several hours each day due to sports being played there, and during those times, you cannot battle anyone there. Big Stadium is closed from 2 PM to 5 PM on Sunday, Monday, & Thursday and from 2 PM to 4 PM the rest of the week. Small Court is closed from 10 AM to 11 AM on Sunday, Monday, Wednesday, & Friday and from 10 AM to noon the rest of the week.

As far as I am aware, the only restriction on the Opelucid City Battle House is that the trainers within can only be battled once a day.

  • I already know that. On some days, I cannot battle the trainers that are there even if there isn't a game going on at the time. Also, I cannot battle the trainers in the Opelucid Battle House anymore. That's my problem. – Obinna Nwakwue Mar 18 '17 at 17:46

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