Because in Pokemon red/green, the game was produced so that mew wouldn't listen, in diamond/pearl, that rule was changed
I think the only way to get Palkia in Pokemon Diamond is to use an Action Replay, GameShark, or trade it from Platinum or Pearl.
well you can use your gameshark or your ds cheat.and the you can catch a trainers glameow.
no you can't you have to either trade or gameshark cheats :P
Only one. Unless you trade, or use gameshark. You can also win them at the TV station in Jubilife City.
You have to evolve it from a Grotile. Or you can trade it with a friend. If you trade after lv. 30 your traded Pokemon won't listen. So be careful.
You have to trade it from diamond, pearl, or platinum.The only possible options you have of getting a Piplup in Pokémon HeartGold would be to either trade for it which means you could to trade it over from Pokémon Pearl/Platinum/Diamond yourself or you could trade with a friend or an online player to get one or you could such a cheating device such as a Gameshark, Action Replay or Pokésav.
trade or gameshark
No you can't. You must have gameshark, or trade it.
Only by trade on GBA or gameshark on PCs the gameshark is EEVEE 39E924C4 4136A9DD 4B78A144 F02E1187
you catch it catch it with gameshark
you have to trade from emerald
trade