Fly Me to the SKY

You have to go through The Shrine of Ru'Avitau to reach Byakko Island becauce the stairs to the teleporting pad to Byakko Island is broken. Go into Ru'Avitau from Genbu side then go to west.

If Yellow Gates are closed, someone has to open the gate touching a Yellow monolith at (H-10) - south side of The Shrine of Ru'Avitau.

Stay at a small room on middle of Ru'Avitau route (H-7) to wait for everyone pass through yellow gate, after that open blue gate ( it makes yellow gates close) then head to Exit.

Keep sneak up in Ru'Avitau.

If everyone is already at yellow teleporting pad to store TP but you can't go through the yellow gates in Ru'Avitau because of late coming, you may commit suicide at (G-6) in Ru'Aun Gardens ( near the broken stairs to yellow telepoting pad ). A BLM can tractor you from the downstairs.

If you are a melee, store TP before using yellow teleport to Byakko island. You cann't be late because nobody can use the yellow teleport pad since byakko pops.

Trade a Autumn Stone ( dropped from Ullikummi ) and a Gem of the West ( dropped from Despot ) to ??? in middle of Byakko island.

Start with RNG's throwing with Unlimited Shot ( ammo: East Wind ( dropped from Seiryu )) to remove byakko's additonal effect: Light damage.

Make Skillchain: Dark, Magic burst with Ice ( Seal + FreezeII, BlizzagaIII, BlizzardIV )

Cast Stun as many as you can. On Byakko fight, BLMs' tasks are Stun-ga, Paralyna and Erase, not nuking.

Byakko's 2hr special avility is Perfect Dodge (30 seconds). Don't use WS while he is under Perfect Dodge.