Coliseum normal battle

Will moving Sr Behemoth (Undead), Marshel, Allo Ver, & Gigantos to above 255 slot, but also update its monster formation 452 for the boss fight, prevent them from appearing in veldt?

This is how monster appear on the veldt:

https://www.ff6hacking.com/forums/thread...l#pid11024

First it will never brach in that function if the "Don't appear on Veldt" proprerty is checked (which can be done in FF3usME). Then it will check if the monster number is over 255. If it's the case the monster is considered as a boss and the formation won't appear on the veldt unless unless one of the other monster of the formation as a number below 256. Then it will check if the formation number of the monster is over 511. If it's the case, the formation won't appear on th veldt, no matter what number the monster has.