Anyways... as for strat... I don't remember much of this battle, actually but... does Mobiletype 8 counter all attacks or Limmitbreaks only? And how many of those counter-lasers can you take before you die?
He counters all attacks. It depends on what "form" he is in though. If he is about to use corona he uses homing laser twice which does about 250 damage each. I can survive that. (But that tends to a character because by then I have low HP) If I attack him in regular form he does about 700+ damage and only Irvine can survive that, and just barely.

Also, what characters do you use? I guess Rinoa's invincible moon could be useful. Especially if you use Angel Wings on Rinoa's next turn which allows her to cast meteor without being killed by the counter-laser.
The problem with this is that Invincible moon is not guaranteed. If, say, I get Angelo Cannon instead I'm smurfed. Also, when Rinoa casts meteor she still gets hit with a counter attack. If she is at low HP and mobile type 8 is in corona mode she dies and then the other counter attack will get sent to another person.