quitting and taking everything with you is justified; after all, you got/traded for the stuff yourself right? It's not like people will blame you for doing that, anyways.
And really, if this was the way it was going to end, why did you start in the first place? :/ It's kinda obvious that once you know how to RNG you can get anything you want lol, but if that's the case, why are so many people still trading? The answer is because it's easier to trade for stuff than to take the time to breed/catch mountains of mons yourself.
To put it simply, trading saves time :)
If you want to quit, you don't really have to talk to me about it lol, all you have to do is say "I quit" and that's the end of it.