How easily level up terra on Kingdom Hearts Birth by Sleep?

Answer 1

For me, the best way is to find a moderately hard/easy place to train, such as the Olympus Colosseum. Then you would go back and forth from the "City near Thebes" and the place outside the Colosseum. Keep defeating all the unversed in each area multiple times. If you want to train anywhere else, just use the same techniques, but make sure that it's a world that you won't die easily.