No, you cannot catch a mew in Pokemon Platinum without cheating.
trade it from someone who did cheat that way you didn't cheat
Go to Toys R Us and ask them but I think the event is over...
its easy to tell which one is platinum because platinum is the only Pokemon game so far that is the sinnoh region, yet it has every Pokemon... almost... ever made that you can catch without cheating.
You cannot catch the legendary palkia on pokemon platinum but however you can use action replay to get it (most likely cheating)
The only way to catch Arceus in Pokemon Platinum is by using the Azure Flute or cheating. The Azure Flute is an event item that sadly was never distributed. This means the only way to catch Arceus is by cheating.
NO you need action replay
trade from hg/ss or migrate from fire red/leaf green otherwise its impossible without cheating.
you can't get ho-oh in Pokemon platinum only by cheating with AR or r4 or migrate it of Pokemon gold
Unfortunately, you cannot catch manaphy in Pokemon platinum without cheating, which, I usually vote against, because it can easily corrupt your file and damage your game. You can always trade with someone who has it.
There is no way You cant Celebi Whitout cheating Unless there is a NINTENDO EVENT.
You cant without cheating
No, not without cheating.