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So we have to follow her into the computer.
Inside the computer is one of the more intereting areas of the game, the Genwun world. A special field is present that sort of reverts the game to gen 1 mechanics. Dark, Fairy and Steel types are converted to normal, being faster raises your crit rate, psychic attacks get a small power boost, psychics are immune to ghost, phys/special split is undone. Most notably, special attack and defense are fused, only the higher stat is used for both. This, however, doesn't take into account stat boosts, so you can't raise your SpDef and have it overtake your spatk and use it to attack. This also means that if your spatk is lower, you can spam moves like Draco Meteor and your attack won't actually go down. Surely this won't be exploited, right?
Some areas mimic gen 1 kanto while others are gen 1 versions of the game's areas. Also, le helix references. An interesting entry in the Cinnabar Mansion area apparently points to the infant Arceus as playing some role in Terra's transformation.
Of course, it ends in the Indigo Plateau Lance room.