Step 1: Sign up at http://www.mytrainerrewards.com/ Use a fake Pokemon name, team, etc.

Step 2: Confirm your email

Step 3: Go to the 'Earn Points' page, and complete all the offers. It's VERY easy (watch video, click on the link, etc). You should have earned around 3000 points. Great.

Step 4: Now we are going to exploit their referral system. Create multiple accounts with your own referral link, and earn 250 points for each account with confirmed email.