You place MHS2.db in the info folder. It contains updated information on items, monsters, genes, etc.
As for your save file only showing items I have no idea, it works fine for me.
The original author seems to have stopped updating however, another user has a fork where they have been updating the program: https://github.com/jim972329667/MonsterHunterStories2
Sorry, I misread what you posted before. Unfortunately I don't believe it is possible to make Infinite Health work with everything, due to the way the codes work. If an attack would one-shot you without the code activated, it will still kill you with it activated.
Really sorry to bother you with yet another question, but how would I go about finding the address(or pointer) for infinite amiibo uses? Thanks so much in advance
All the recent Zelda games(Skyward Sword, A Link Between Worlds), Mario 3D World was really fun as well, the Pokémon games, Super Smash Bros, Fire Emblem Awakening and Fates, Pikmin 3, Donkey Kong Country Tropical Freeze, Animal Crossing New Leaf
That's your opinion. I still have as much fun, if not even more fun with recent Nintendo games than I had with the old ones. To each their own I guess.