This trick will allow you to have an unlimited amount of points for a created player. It also works with the existing players and enables you to increase their stats to perfect.
The process takes about an hour to make a perfect custom player.
While in the creation process, go to "Traits" and select all the negative ones (they give you 1500 points).
Press A to exit the Traits screen. Select a category (such as attack, defense, etc.) and distribute the points as you wish.
When finished, press A. Go back to the Traits screen and de-select the negative traits. Press A to exit.
Press Start and save your player. Re-open your created player in the edit player feature. Repeat the previous steps until the desired stats are achieved.