I just beat vol opt for the first time & i went in the warp path. I read a few messages & then I went back to pioneer 2 through the teleporter. I talked to absolutely everyone I coud find, but still, no option to visit ruins. I never had this problem with the other courses, so what is wrong? :S I really don't want to have to fight Vol Opt again...
if you didnt quit the game first then he should still be dead when you go in
You have to go back to forest, cave and mine, and 'talk' to the big pillars you see in each. Caught me out the first time too.

You've missed the pillars throughout the area 2 on each level. ie, there is a big pillar/monument in Forest 2, Caves 2, and Mines 2. You'll have to go back through each level and look for it. Run up to it and activate it.
You need to have activated every column, and then you need to enter the ruins through that little passage. You may return to the Pioneer 2 from there.
thats only if the door was locked
But I just beat him once, & now the game wants me to do it again? That is just not fair. My poor little force is only lvl 14.
How did you do it the first time?