Thanks you,
* Did I made a mistake in the monster's data ? Normally this version only have 12 monster species with most of them having 3 maturity stade, with front and back I have a total a 66 arts (I have made an error on the number 11).
* Indeed many transitions are missing, for the impression of game crashes due to loading time I remember having those impressions sometimes playing Pokémon Red and some other games on NES, I optimized to reduce the waiting time but it's part of the NES feeling ^^. In the end it was hard to add code with banks full I was fighting every bytes to add small functions making the polishing phase difficult.
* I wanted to have different monster roar, the lengthy polishing phase didn't let me work on that part, I made a WAV converter for the NES audio chip which work nicely, I would have mainly needed to hunt all the roar sound and check the output.