they are both perfectly good, if they're the same level, It's all depending on the type you are fighting against, and if you want more speed, more attack, or more defence. to get gengar, though you have to trade, and you have to wait an awfully long time at le chatue tv for rotom. It's up to you!
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Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.
you have to either steal one from fantina or trade haunter
You can get rotom by in the haunted house near eterna city and after 8pm and go to the one witch has the scary picture on and press A at the tv and you should get rotom. Rotom can be caught by a normal great or ultra ball
In Diamond, pearl, and Platinum you go to the old chateou at night, talk to the TV say yes when they ask you if you want to thump the TV, then you battle rotom. He is level 15 in Diamond and Pearl, and level 20 in Platinum.
First you need to trade Rotom from Pearl, Diamond, or Platinum. (Rotom is at the Old Chateou which is at the Eterna Forest. Go there after 10:00 pm and press a against one of the TV's, Rotom will pop out and you will battle. Rotom is at lvl. 15 and is Electric Ghost.)(Pearl,Platinum,Diamond) make sure Rotom is the first Pokemon in your party, when you do that the elevator will take you up to the next floor when you will see items that you can give to rotom to change it's type. items: Fan Rotom - Electric Frost Rotom- Ice Heat Roto- Fire Mow Rotom- Grass Wash Rotom- Water