Hey everyone I need help 1.there are some cheats codes in the cheat section..

1. Assuming that you mean the passwords for the combo cards and cheat pack codes, make sure that you are using the correct password and that you do not already have the card that you are inputing the password for. Make sure that you use capital letters in the right places, and is that does not work, try changing thew Letter O for the Number 0. Once you have typed the password in, double check it for mistakes.
2. Not as far as I know, but I think it is best to battle two opponents at once in a training battle (I normally use the sonic and tails training battle at Tail's Lab in Sonic's episode). You can get much more than skins by doing this; Rare cards obtained from normal battles can include Emerl's ultimate skills and the incredibly rare ??? Moves. I found a duplicate Ultimate Heavy attack by doing the battle I was just talking about. Hope this helps.

Also, I forgot to say on my other answer that when doing the training battles for the rare cards, combos are the way forward. Spam the opponents with combos, and don't get hit once. Then, you will gain 5 Skill Points and have an increased chance of a rare card.