1. If you're actually using a real DS, then you need to buy a cheating device such as Game Shark, or Action Replay. Once you've bought one of these insert it into your DS and then put the Pokemon Platinum game inside of it, and then you should figure it out from there.
2. If you're using a DS emulator on your computer, then do this. Most emulators such as NO$GBA and DeSmuMe have an option in the upper left hand corner under 'emulation' to 'cheat', you will then enter your cheat code there.
Notes: Cheat codes for DS game are long number and letter codes that you can look up depending on the cheat you want. Hope this helped!
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how can i get a level100 palkia in pokemon platinum
Migerat it or trade it. You can't use the cheat card on Pokemon platinum.
yes
cheat or trade
by using a cheat