Dude, it's not 'great' for Pikachu to have that orb inside of him. It makes him go nuts, totally nuts. There are pics of what he looks like with the orb inside of him and it's totally creepy... But Lance comes back in it, so it's not all bad... Don't know how it will end though... But it IS indeed two parts.
The 7th Movie is about Deoxys and Rayquaza, just to clarify. The Hoenn movies will have no bearing on the 'Groudon vs Kyogre' issue. That is going to be covered in the series.
The last Hoenn movie won't either, because it's ALREADY slated to be about a 4th Edition Pokemon.
One Absol means a great disaster is coming. So, if there are a bunch of them, or if one gigantic Absol shows up, I guess that means the characters are just screwed...