#3 is Persuasion <got mixed up sorry>

Anyway try this one!

I am a collector of information.

It is my trade, I spy and lie it is my favorite thing to do.

My enemy is a man who has a Iron will.

Although I feel I'm the master of swill, but I'm a man of many skills.

People say it is inevitable that I will lose, but the man of Iron will wear lead shoes.

Who am I?