Heh, not as high as your record, but mine is 169 or something.
How I got it: This was frustrating, you need Lloyd and Collete (-_-) and Raine for this. Lloyd with Sword Rain Alpha and Collete with Stardust Cross. Raine is optional with her Photon, but is really helpful. But.... I didn't have Stardust Cross at the time so I had to work FOREVER for it cause she was the wrong type and had to switch her over. Raine, you should have Photon by now for those really big guys. And Lloyd should prpbably have his Sword Rain Alpha skill by now, depending.
Now for the trick, go fight a BIG MONSTER (i.e. Dragon in the Earth Temple, Mithos' final form, the huge carnivore plant thing), and once you're fighting that monster, make Lloyd use a huge combo ending in anything beast (Beast Sword Rain is helpful), but don't forget to MAKE RAINE CAST PHOTON AND HOLD L. At the end of the combo, if Raine is ready, let go of L to have her cast Photon to bring the enemy back up, then do the combo AGAIN. You can try a second Photon, but only if the monster has higher than 20000 HP or something, so if you do Mithos on mania mode, it can help alot.
When you feel like the enemy's about to die, or you want to get on with the combo already, then do another combo WITHOUT A HUGE KNOCKBACK and use unison after. Note: MAKE SURE YOU USE LLOYD'S SWORD RAIN ALPHA AND COLLETE'S STARDUST CROSS, OTHERWISE IT WAS ALL FOR NOTHING! Now at the end, you should be able to use Stardust Rain, which has the highest combo hit ever, going up to 100, but only on a big monster, cause it doesn't home in on the enemy like Prism Stars. After that, you should get somewhere to an 167 or something hit combo, or even up to 200. The huge letters show the most important stuff.
A lot of people know this combo, but I didn't at the time until I watched a youtube video of it, cause... well.... I really don't like Collete that much....... ok, so I hate her, but yeah. You can try Prism Stars too, but you may need to have the Second Unison (forgot the name) EX skill on, and hope for another Unison to pop up. I did that on Maxwell, first time I got over 100, but not as high as the Stardust Rain combo.
Ok, I'm done. Hope this huge writing doesn't make your eyes explode.