Ok, there are a few places in the game where you can teleport to Lavos' PD to fight it: the OP back in 12,000 BC, the BO in 12,00 BC, 600 AD, and 1000 AD, the sparkle on the right Telepod in 1000 AD (New Game + only), the bucket to 1999 AD from the EoT, and finally the Epoch crashing through the first form in 1999 AD. Now the Epoch method can't really be taken into account in this thread since you can't leave the shell once you enter.
Here's my thought: no matter what time you choose to fight Lavos, you first beat its first form, the outer shell. Then you go inside and beat its nasty triclops-like figure. Then you fight its third, final zombie-with-two-acorn phase, which finally kills Lavos.
Here's the thing...when you beat the first form in any method outside the Epoch, you can leave and go to any time frame, then come back and finish the job. Say you fight Lavos through the BO in any time period, but for the sake of this thread we'll say it was in 12,000 BC, beat the outer shell, then leave. You go to 2300 AD, it's still in ruins. You go to fight it through the bucket from the EoT, its outer shell is still destroyed (go to fight it throught the Epoch and you get the same result you would've if you'd tried that method the first time, making the waste of the precious Time Machine pointless, lol).
So here's my thing: it can still do the same thing to the world in this form, without the shell being dead? With the shell dead, making it rather useless, wouldn't Lavos have to crawl out and do its damage in another way, changing the way the world is destroyed?
Most of you will undoubtedly say, "No, killing its shell does nothing except to get past its outer defense, and thereby get to the real thing."
Looking at that answer, I suppose I would agree with that. But here's another point: why does it sit around after the shell is destroyed, potentially for thousands of years, and just wait for Crono and crew to destroy it instead of rebuilding its defenses, or part of its body essentially?
Many of you will answer, "PD, retard." And I'll say "OK, fine. Have it your way. I guess that means, unlike the theory I heard before that says that when a time period is left, it is returned to at a time relative to how much time passed to the character since they left it, that they arrive right when they leave, right? Otherwise Lavos would probably take the time to rebuild itself, wouldn't it?"
What's my point?...suddenly I don't know anymore. I thought I was onto something at first. I think the more I looked into it, I realized that I didn't really have anything, just an interesting perspective on Lavos. Something that seems to have been answered already by the PD thing.
Unless people wanna argue my agreed point of the relative time thing for when you leave Lavos and return. Cuz that makes sense to me. *shrug*