here is a link to help you understand what a rom is
it has a few legal roms on it (yes there are such things) here is a description by the webmaster
I m p o r t a n t
I n f o r m a t i o n
* We do NOT have commercial Rom Images, do not ask for them! Any E-Mail regarding commercial roms will be forwarded to the ISDA, BSA or any other responsible authority! There are several other places to go! So again... do not bother where to get game 'XY'... don't waste our time with such things!
* All Games and Demos avaliable here are Freeware, Public Domain or were legalized for free use by their authors! Some of them are even with source! It's legal to copy them! You'll not break any copyright law! In case you find something here which is definately not free, please let the Webmaster know about it, so that he can remove it!
* Please read the extended Disclaimer once you entered and follow them.
i have been authorized to post this link on this site before and if you guys would rather not have this here even though it is legal go ahead and delete my post
http://www.pdroms.de/
As far as i know that is the only legal roms site there is, so unless you want to go that other route ( in which case, hush hush try not to mention anything about it) this is your only option
unless of course you want to buy the actual cartridges and get specific hardware to dump the roms onto your ppc which could end up costing you upwards of hundreds of dollard, or so i hear