Ashka

Just hack the items required to trigger the events, then catch them of your own accord.

It's what I did. All you're doing with this method is removing the regional boundary.

^ typically what I did, especially in Diamond when I had dat action replay

I caught Arceus "legitmately" in a Cherish Ball c:

That is typically what I do, I guess it's the best way. Some things like Genesect are gotten straight away, though I think there might be codes for that too by now, and if not I can PokeEdit them or something. Luckily I can catch the vast majority of pokemon myself, without using anything. I don't have Action Replay but I'll probably be able to work something out with my Supercard.