I've the same problem but for my partner, what should I do ?You will need to find out what's the pokemon in question regular hp on it's current level, like this:
View attachment 198765 View attachment 198766
so in my case 44, convert it to to HEX (002C), and activate this code:
[Max health Player]
04000000 05562290 0000002C
04000000 05562294 0000002C
Go to a dungeon, leave, save the game and restart, good luck