[PLEASE HELP] Using ACTION REPLAY for Event Pokemon

[Lethalflare]

I'm thinking of borrowing my friends AR (and his DSi) to get all the event items on Pokemon Platinum, SS and White.

I'm just worried, is there any way to tell if the Pokemon is hacked? Can I use them in etc Battle Tower without problems?

And, how do I add those events from the gallery to a AR code? Can't I just use the codes from the action replay homepage? What's the difference? Need help ASAP :-).

Thanks.