Turn on your ds and go to your settings and change your time there.
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In Pokemon Diamond and Pearl and Platinum which are the newest versions on the DS until the newer ones you catch Rotom after you get the national pokedex. Then you can transform him into different types.
trade it from Pokemon platinum, dimond, or pearl. or you get ine by event on some time in 2010
In the main screen even before you enter the Pokemon platinum game you can go to your ds settings and click on your clock to change the time to the correct time so that you can activate rotom to battle you.
In Pokémon Platinum, you can obtain multiple Rotom by trading. Here's a step-by-step guide on how to do it: **Catch the First Rotom:** **Location:** Old Chateau in Eterna Forest. **Requirements:** You need the National Pokédex to change its form, but you can catch it with just the regular Pokédex. **Time:** Nighttime (8 PM to 4 AM). *How to Catch:* Go to the Old Chateau. Enter the room with the TV. Interact with the TV to encounter Rotom. Capture Rotom. *Trade for Additional Rotoms:* Since you can only catch one Rotom per game, you'll need to trade with other players to obtain more. Use another Nintendo DS and a copy of Pokémon Diamond, Pearl, or another Platinum game. Catch a Rotom in the other game(s) by following the same steps. Trade the extra Rotoms to your main Platinum game using the Union Room or Wi-Fi Club. By repeating this process, you can accumulate multiple Rotoms in Pokémon Platinum.
If you mean Rotom, heres a tip: go to Old Chateau (night time). There is a room with TV. Examine the TV, and you will fight Rotom. WARNING You have only one chance to catch him!