Enter the codes before pressing continue. Go to Wonder Mail S, then Receive, then finally Password. Please note that you can only use each code once. Not all of them will work. But most of them will. All you have to do is go to Beach Cave, Find Bulbasaur then He'll give you a Golden Seed and something else. If they all work, you should grow a total 40 levels.
If you want me to make you any just PM me what you want, I'll make it, test it to check if it works then I'll give it to you. Please rate good! Thanks