Japanese DP-DPt Era Battle Roads

I just wanted to ask the group if anyone was knowledgeable/was around during the early-mid Gen 4 tournaments and whatnot. I’ve hit a bit of a snag with my coin research, and can’t entirely figure out what is going on here. I have data that seems to suggest ten different gold coins being randomly handed out as winner’s prizes during this time, but I am not entirely satisfied with that conclusion. I was hoping someone could either provide a bit of insight here, or at least point me in a direction of something that could.