Trainers.info gave a trainer the player's chosen rival name only when its
class was called "RIVAL". A mod that translates the class (RIVALE in
German and Italian) made the rival battle as the ROM's placeholder TERRY,
and the champion, whose class is CHAMPION, was always TERRY. pret's
B_TXT_TRAINER1_NAME names TRAINER_CLASS_RIVAL_EARLY, _RIVAL_LATE and
_CHAMPION by the rival's name (pokefirered/src/battle_message.c:2078);
Trainers.info now does the same, by class id.
thibautbus