First of all if you want to gain high exp. points for your starter, go on 'Set Moves'and set the moves 'Toxic' and 'Dig' for your starter. Then click the link 'Trainer Battle'. Type in the box that comes up, 'Back to black' and when the results come up click the first one that says 'Back to black'. When the battle starts DarkBlissey will be the Pokemon you will have to battle. First use 'Toxic' on DarkBlissey twice and then 'Dig'. Continously do this until DarkBlissey is KOed. Do this technique to the DarkBlisseys that come up after you defeat the first one.