I had a lot of trouble with her too the first time but the next time I played the game (in platinum) I had Rotom on my team and the underlings gave me more trouble than she did. and if you just level up your starter like 10 - 15 lv.s above hers that should do the trick too and don't worry about over leveling it cuz most of the time my starter is 10 or more levels above the badge limit. hope this helps.
currently have no games to trade from sold my B/W to my sis.
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