Add the facts that Rena starts out with only a sword, one of the only 5 beings on the entire planet not against her due to Arthur tricking everyone (all of the group members are pokemon) is actually a spy and Arthur's most trusted legendary (also said legendary was Rena's best friend), there is another pokemon who's been manipulating Arthur, and that all the pokemon that Rena and her friends are fighting are shadow pokemon (the legendaries being XDs, including the spy in their group) that they are forced to kill due to the Celebi of Agate Shrine being made an XD herself, and you've got a lot of trouble for a former pokemon god that now only has as much power as a human to handle. (Oh, and Missingno even plays a role in the conclusion. the ending is bittersweet because of it...)