Chrono Trigger
Lavos
His second form is nearly impossible.
Which second form are you talking about? Depending on how you find Lavos, he really has three forms...If you fight him by finishing all 8 sidequests (the last one being the Black Omen) or by using the bucket at the End of Time, Lavos should have three forms. But if you fight him by using the Epoch, he'll only have two...Is that what you're talking about? Because Lavos's third form is the one that makes you want to pull your hair out...However, I made a simple strategy to beat him (at least how I beat him, anyways).
There are two Bits on either side of Lavos. The one on the right can revive the Left Bit or the Lavos Core (I think that was what it was called...correct me if I'm wrong). The Left Bit can heal the Right Bit and the Lavos Core, and also serves as a defense mechanism for Lavos. The Lavos Core will use all of the unbelievably strong attacks, which will definitely require the use of a few Barriers, Shields and the like on your part. If you defeat the Right Bit, the Lavos Core and Left Bit will die automatically. So naturally, you're going to want to put your strongest attacks on the Right Bit.
Have Crono, Marle, and Frog in your Party. Have Crono and Marle use normal attacks on the Left Bit, while Frog uses Leap Slash. The Left Bit only has about 2000 HP, so this should KO it pretty efficiently. Once Lavos Core turns off his defense after the Left Bit is dead, use attacks like Arc Impulse (Triple), Luminaire (Crono's ultimate attack), and any other hard-hitting attacks on the Right Bit (and on Lavos Core, if the attacks affect more than one). When your HP is low, have Marle and Frog use Double Cure, and have Crono attack the Right Bit. Also, Elixers and Megalixers are very helpful for replenishing HP and MP. Repeat this process until the Right Bit revives the Left Bit, and once the Lavos Core turns its defense back on. Using the aforementioned strategy, defeat the Left Bit again, and continue to throw your strongest attacks at the Right Bit. If your level is high enough, you should be able to defeat Lavos.
It took me a while to beat Lavos (a week, maybe? Doesn't beat my two weeks of fighting Adel in FFVIII, and then accidentally DELETING my freakin' game, but hey...>_<), but that was the strategy I used. He's most certainly not a walk in the park, seeing as how CT was made back when the hardest bosses were saved for the end of the game, but he's far from impossible! ^_^ Hope this strategy helps whoever uses it!...Aw, writing this makes me wanna go play CT again!! ^_^