That's what people said about Ruby and Sapphire. Oh, and Diamond and Pearl.
Everytime people say that they're wrong. Ever since the first generation, there have been two games released, then awhile later a third installment.
I am bookmarking your name so when it's announced I can say "I told you so! :D"
Ruby and Sapphire had a Third Legendary that wasn't used but played a pivitol role in the back story. The same in Diamond and Pearl. Those two games were designed to have THREE main legends. Red and Blue were designed with three games, one for each starter. Red, Green, and Blue. Yellow is the fourth in that series and is based after the Anime. Yellow was more of a Fan addition whose story line was different from Red and Blue.
Gold and Silver had two main Legends and that was it. Crystal wasn't related to either of them story wise as it centered around Suicune, a lesser Legendary that seemed to get the luck of the draw in being picked to head line a game.
As said before, Ruby and Sapphire was about Groudon and Kyogre respectively. But THEY have a Third Equal, Rayquaza who ended up getting his own game by combining Ruby and Sapphire's story lines.
Diamond and Pearl ALSO had a third Pokemon that tied into the main set. Diamond had Dialga, Time. Pearl had Palkia, Space. Platinum gave Giratina its time to shine who represents Dimension and worked as a balancer between Time and Space. Platinum was once again a Copy Pasta of the two story lines into one, even though Pearl and Platinum had One single story line to begin with.
Black and White is centered around Reshrim and Zerkom who are Ying and Yang Pokemon. There is only two things in this. IF they make a third, it would have to be outside of these two OR these two together in the same story. Which raises issues with items they have in the individual games, namely White Forest and Black City.
Learning from fact, a third may be immanent. I'm saying that They left no room for a third Legend UNLESS the introduce one before the release of Black and White or show us something afterwards. The two before that hosted three showed all of them together. And they were all shown to be in game.
Unless Vicitini is the Third head liner, our highly expected third game is going to be some lesser Legendary like Suicune with no tie ins between the story or a merger with no main legend.
EDIT: What I want to say: WHY are we discussing a game that won't be out for at least another two years?
