ok, so i made this battle awhile back on Anime Vice, since it qualifies more there, but since there aren't that many people on Anime vice i thought i'd try my luck here.
1. this is obviously a cross over anime battle so both opponent's abilities and skills will affect each other, so none of the "Genjutsu won't work on Byakuya cause he doesn't have chakra" or "Itachi wouldn't be able to see Byakuya" stuff
2. both players are at full strength (Itachi doesn't have that mysterious illness)
3. battle til the Death or until K.O
4. fight takes place in a forest
Byakuya has Senbonzakura
Itachi has standard ninja gear such as kunai, shuriken, paper bombs etc.