You're new, so I'll be nice about this, but this topic has literally been discussed a million times.
Classic was never made with trading in mind. It would completely de-stabilize and ruin the game. If you want trading, play Era.
/thread
Edit - Of course the thread didn't end. This always garners discussion, no matter how many times its been discussed. So I'll add one more thing: A lot of us don't want it. Because we understand what Classic is about. The point of Classic. The concept of collecting, and how a trading system would completely nullify the very foundation of everything Classic stands for. That's not something you can understand in 2 days of playing..