Dolphin crashing when using cheats?

[Manaplayer]

Hey,
i asked myself if it is possible to watch the current values of a memory line. It would be a lot easier for some things:
If you already know in what memory adress is your place for an item but not which item has what value, you could experiment with some items you already have and could find which item has what value. Or is there a method i don't know?