It seems to be working after rebooting my PC. I don't even have to select HIP, I can just select the G8 figure and apply pose. Weird thing was all my other poses were working before the reboot. Thanks anyway.
ok, I've found out the real reason why it didnt work before.
Apparently the pose file only applies the pose to the first key frame and leave other key frames alone, I was working on other key frame, that's why the pose didn't work.