The battle mode graphics in Chrono Trigger are:
- 0x3FF488 2bit graphics in 6x2 formation for "Active Time Battle ver. 2"
- 0x3FF008 4bit graphics in 12x3 formation for "Battle Mode"
The elements graphics are at:
0x3FD5E4, 0x3FD764, 0x3FD8E4, 0x3FDA64
Each in 6x2 formation. None of these are compressed.
All this information is available in the source code of Chronotools: http://bisqwit.iki.fi/source/chronotools.html