You can find Giovanni Dos Santos in Barcelona's reserve list. Although he is only 69 overall, you can edit his stats and make him as good as Ronaldinho. You will then have two of the best midfielder's in the game.
To get infinite player creation points, go to "Traits" and select all the negative ones. Then, press A to exit the Traits screen. Distribute the given points to the category of your choice and then press A. Return to the Traits screen and de-select the negative traits. Press A to exit. Save your player and then reload your player in the edit player menu. Repeat these steps until your players stats are maxed out.
To get cheaper players at the end of the season in Manager mode, choose not to renew your contracts of the players you want to keep. When the transfer period starts, you can transfer them without paying fees and re-negotiate a cheaper contract.
When playing as a good dribblers such as Cristiano Ronaldo and Robinho, run downfield with the ball and, as you are running or juggling, rotate the Right Analog-stick clockwise once and your player should do the rainbow. Remember, do all this while running with the ball.
ACHIEVEMENT - HOW TO UNLOCK Winning streak (90 points) - Get a 60 game Winning Streak on Semi-Professional. 10 Goal Match Wonder (100 points) - Score more than 10 Goals in a match on Semi-Professional. 300 Game winner (200 points) - Win 300 games in all competitions on any level. Defender Man of the Match (50 points) - Win "Man of Match" for a Defender more than 50 times in Semi-Professional. Midfielder Man of the Match (50 points) - Win "Man of Match" for a Midfielder more than 50 times in Semi-Professional. Striker Man of the Match (40 points) - Win "Man of Match" for a Striker more than 50 times in Semi-Professional. Goal Getter (40 points) - Get an average of 4 goals per game over 50 game on Semi-Professional. Undefeated (50 points) - Remain undefeated for 50 games in Semi-Professional. World XI Master (80 points) - Win 20 games with the World XI team on Professional. Fair Play Award (100 points) - Play 20 Games without a card being shown in Semi-Professional. Undefeated Manager (200 points) - Remain undefeated for 1 season in Manager mode.