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I agree with Supreme Warrior, and don't download castlevania games for N64! There supremely crap!
The only probabal good RPG for N64 (Like nemisis said) other than paper mario and zelda is Hybrid...

But most of the RPGs on playstation are good, I'd recommend you check those out:)

Well when you say turn-based, I will assume you mean non-active battles...
Here is a list:

Lunar 1 & 2(for Sega Genisis CD and Playstation.)
Golden Sun 1 & 2(for the Gameboy Advance.)
Phanasy...

Well, I should've mention anything that it must not be from the golden sun series or final fantasy...

But I was tired and hasty so I forgot to add that part...

Give me a nice,gameboy advance RPG that did not stand out of the crowd.
I'd be very happy if someone were to suggest one.