Doing this with FFIX will kill the game. The acceptable level to get the most challenge but not have it impossible imo is about 50-60.
Slow down the bucko. Some people might have nothing to say, and some views are made by lurkers, who can't post ;p
bzzzzzzzzt. wrong.
You don't need to be overleveled to kill the Grand Dragons there, you just need to have level 5 death. I killed some my first round there at a low level, just gave Quina the Coral ring to make sure Thundaga wouldn't 1 hit my party ;p