Best Exp Code Possible... - Pokemon Soul Silver
Aug 22nd 2010, ID#6138 Best Exp Code Possible...
This gets you from lvl 1 to lvl 100 in one battle against anything.
I just tested it on a lvl 2 pidgey and it works.
Don't even need to hold R. You might need to replace the 600 in seocnd line with 560 or 520 if you end a battle and don't get any exp.