If I am correct in yellow , exclusive to yellow, m (maybe it was another one) changes the sound, graphics, gives you the holding of 40 something Pokemon instead or 6, glitches the nurse heal, npcs can disappear, npcs can be where they shouldn't be, npcs can have the wrong graphics, you can walk through some walls or all walls, crashes appear, corruption is there so do not save whatever you do (to achieve this level the Pokemon to level 9), the fake Pokemon randomly evolve, the Pokemon are poisoned, these Pokemon can do glitches evolvutions (kangaskan turning to kangaskan), random flashes that are not from the poison, infinite health, much more move pp, no switching Pokemon in battle, and there is more but the last I wil last is duplication of items