I uncovered a neat trick the other day. If you need to remember numerical passwords/pins, just use a combination of pokemon as a shortcut. I find gen 1 mons work the best for this, especially with pins since you just have to remember a pair of mons. For example, if your pin is "1234," I can just remember "Butterfree Nidoking." I honestly find it easier to remember series of pokemon than random numbers. Just wanted to share with you guys.