1) Start a new game
2) Once you can control Rhys save the game (F5 in Genecyst) and quit
Open the save game in your favorite hex editor. Set the values at E144 and
E15A to FF. This will let Rhys use the aero parts and Laya's Pendant even
though they're not in his inventory.
Start
Alright usual stuff here. Go upstairs to marry Maia. Escape the dungeon
and so on..
Southwest Landen
When you leave Landen head east to the airstrip. Wren will transform
even though he's not in your party. Fly down to the southwest and enter
the palace.
Laya's Pendant
Laya's Pendant will work. Head on through to Elysium.
Elysium
Hop over to the nearest airstrip.
Rebel Cave
Fly over to the rebel cave.
Sub Parts
You'll have the dialog with Ryan and Lune. Mieu will join the party. Go
grab the sub parts when that's all done.
Whirlpool
Travel back to Aridia and enter the whirlpool.
Laya
Go meet Laya, who looks like Lyle, but Wren actually joins the group.
Zany.
Off to Frigidia
Run down to the southwest palace and travel to Frigidia.
Frigidia
Go to the nearest airstrip.
Skyhaven
Talk to the dudes in Skyhaven and head down to the dungeon.
Aero Parts
Get the aero parts and trek back to Landen.
Orakio's Sword
Go get Orakio's Sword, unleashing evil and such.
Miun
After getting the sword Miun will be waiting in the desert. Go talk to
her and..
Crash!
So close! Apparently there are more events that need to be set for this
to work. When they're found I will post the results here.. I think it
should be possible to have Rhys fight Dark Force if the right events are
found.