As others have said, I'm afraid what you've found is NOT actually a table, but text being printed in ASCII order inside the data of the ROM, for one reason or another. I admit that I don't have a whole lot of experience, but it actually isn't too uncommon in GBA games from what I've seen. In fact, I've seen exactly what you've described in both of the Japanese GBA games I've dumped in the past. It is probably an artifact of the software they were using to compile the data.
In the Ganbare Goemon 1+2 ROM for GBA, it actually includes windows directory paths for someone who was working on it. Pretty fascinating the stuff you can find.
But, alas, it has nothing to do with a 'table' and what you found is the normal, run-of-the-mill ASCII encoding. A = 41, B = 42, and on and on.