Easy way to defeat all gym leaders - Guide for Pokemon Diamond
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Roark: With Piplup as your starter, you can beat Roark with ease if it is above level 12. If you already have Prinplup, it will be ultra easy. Gardenia: Catch a Buizel at Valley Windworks, and then you can trade it in Gardenias town (I forget the name) and have a Prinplup know Peck. Be careful of her Roserade, though. Maylene: If you have a level 30 Flying type and a fighting type, it will be very easy. Crasher Wake: Have an Empoleon for the resistance, and have a Raichu for the offense and it will be easy. Fantina: This one is a little hard, but if you have Empoleon that knows a strong water-type move (Brine is recommended), it will make it a little easier, and if you have a Drifblim that knows Ominous Wind, it will be a little easier. Byron: If you have Empoleon, Machoke, and a good Fire type, youre unstoppable. Candice: This one is very hard if you have Torterra, but if you have Infernape, youre good for the majority of the battle. Just switch to a flying type when she brings out her Medicham. Volkner: This battle is very hard, but if you keep your ground with a good Ground type or a Dialga that knows Earthquake, youre good for the battle. If you have a Ground type, switch to an electric type when he uses Octillary.