Nah, not gonna work.
There is no place you only pitch the project without execution the game from your self, if you feels the games was really successfully then pitch and hired some developer programmer to create the game for you and you can pitch them to looking some partner/fund maybe. Without a working product, that's could be hard too for your pitch, so, unfortunately, you will not find it.
This comment is right, I was going to say that you should look for someone that is going create the game for you, a good programmer that will do the job, after that you can then look for whatever support you’re going to be needing next, whether funding or partners.
If you don’t know how to go about finding someone to create the game, you can check freelancing websites, there are professional programmers who are waiting to take any good offer, so be ready to choose the best and pay to get what you need. Good luck with the game you’re about to create.