I think I said it before, I really love worldbuilding. In books and comics and movies I tend to get drawn in by worldbuilding a lot, and I think I got too wrapped up in here to consider stuff like what you mentioned...
When I said revising stuff about the Legendaries, I mostly meant finding a way to take them out of the picture so they couldn't simply swoop in and fix everything. And your point about needing a way to make the protagonists special is very valid too. Just want to say, if anyone does have any advice or suggestions that they feel would make the RP better somehow, please speak up. Anyways, I think I found a way to restrict the world of the RP, and also give the protagonists a fighting chance.
The former is simple: the Legendaries creating the spell to cross time and space to bring Giratina back did not account for the existence of the Corruption. Its malignant power warped the effects of the spell, splintering Sinna off of Omnia and dragging it into a pocket dimension, somewhere between Omnia and wherever the Corruption was born. I need to find a way to limit the Legendaries at the festival (possibly in all of Sinna) to just Celebi and Hoopa...
And now the fun part. Just why the protagonists have anything resembling a chance against Giratina.
Celebi and Hoopa used their Psychic abilities to connect with the Legendaries in Omnia and allow them to bestow upon the group the status of Chosen.
What's a Chosen? Well, I typed up a few notes on them.
Being a Chosen links you inexorably with a particular Legendary, granting you strength to rival one. Aging slows, minor injuries heal faster, disease is unheard of, and there is even a slight resistance to the Corruption. In addition, the Chosen are capable of entering 'Seraphic Mode', granting them a move set composed of their Legendary's moves, and a superpower associated with that Legendary(for example, a Chosen of Suicune could purify water, a Chosen of Lugia would be able to conjure storms, a Chosen of Genesect may have access to cybernetic modifications, etc)
Be warned, though, that the sheer amount of divine energy channeled through your mortal body during Seraphic mode may cause your own powers to possibly feel increased and difficult to control, as well as for feelings of giddiness and euphoria to arise. While this does not sound serious at first, there is a myth about an ancient Chosen of Groudon spontaneously combust after using Seraphic Mode to hold off an army.
The goals of the Chosen would be twofold:
First, purify(or, if that's impossible, kill) Giratina and any other Corrupteds.
Second, assist Celebi and Hoopa in reversing the effects of the warped spell.
Thoughts on this?