Using the method I explained, playing the games and gaining the points yourself, is what I would call the legitimate way of EARNING the secret characters. Yes, it can and will be a pain but achieving it is all the more sweeter when you do it yourself.
Generators take the fun and mystique away from it all. Besides, I would advise against providing a site your user name and password, and this applies to anything online. It's basic internet safety and security. Furthermore, I heard that the generator was axed because Bandai probably caught on to it:
https://www.tamatalk.com/IB/index.php?showtopic=170953. Of course, I can't force you one way or another, I'm just stating my best advice and opinion.
That being said, I'd like to reiterate that I HIGHLY recommend reading over the information in the link I provided in my first post. The posters in that link worked very hard to obtain that information for us. Good luck!
P.S. I myself am working toward 4th Gotchi Golds, so I know how time-consuming it can be (and no, I'm not some bum with unlimited free time, spending all my time on the computer in a basement or something...no offense to bums worldwide.
I am a full-time student with a life outside Tamagotchi world and all
). Just take it piecemeal and over time, it will come! I find the process kind of fun, actually!