KG is Raiden's alt bio. You need only 287 Gold to open it. Beat the game in Arcade and you'll have the coins.
Can you help me open koffin MO. I know it's Dragon King's Temple arena but I can't find the key. Where is it?

ye thats no problem...
MO - Chaosrealm D-7 (2-8 am) in a house
explain to me why the koffin is locked and everyone says its costs ......koins??

RAIDEN'S ALTERNATE BIO KG NEEDS A KEY TO OPEN IT NOT KOINS...

ok? not can you tell me where i can get it?

I have all the koffins except KG I can't find the key I also need help....

I think I can help, Raiden's alt. bio(KG) is found in outworld G-1, its on your left behind a house near the wall in the city that Hotaru took over, also I got it on a thursday around 12:30 p.m. if time matters.

JO should be Shujinko's Alt costume...I read somwhere the key is in F-1 Edinia at 3am on tuesday but I never could find it.

If it helps I got it after 3:30 a.m. in F-1 Edenia inside a building, the only on in F-1 for that matter. Also it disappears quickly, I think in a half hour, so what I did was wait(or meditate) infront of the door until 3:30 then I entered and it was there.

*sigh* I've tried that on two separate profiles, and still no JO key. 3:30 a.m.? Check. Tuesday? Check. Only building at F1 Edenia? Check. Chest with a key in it? Nope.
I can't help but think that maybe there's some other quest you need to do or fight you need to beat to get it... Or maybe it only becomes available at a certain time? Kind of like Sindel's Ring. Plenty of people say they found it at H3 Edenia, behind a rock. Some people can find it, some can't. I found it on one profile, can't on the other, and can't imagine what it could be that I've done different from one time to the next...

well thanks
i guess those people who "got it" cant help...cuz barely anyone cares about helping, except you guys...tnx