For the moment being, I am not separating leaderboards any further, however, I did made the disntinction since I remember that your first Multi streak was done with an NPC partner that used your 2nd game's team. On this case, since this new Multi streak was done by you controlling both players, as such I updated this on the leaderboard. Hopefully it does differentiate both streaks and thanks for filling that empty slot! Let me know if you have another suggestion since I don't have experience on how Gen 3 Multi battles work.Kommo-o, I'm wondering if this mode should be counted separately from the standard multi mode where you partner with an NPC - later battle facilities don't distinguish, but they're considered separate modes in Emerald, and the internal records are counted as such. It's certainly a very different experience from partnering with an NPC.
I did try to use your trick on registering an NPC with a party I wanted them to use. However, it didn't worked and instead I got a rooster full of apprentices. I asked Runeblade14's save file to test but couldn't get their NPC registered on my save file. Dunno since I did made a couple of Multi battle runs.