It is known that in Gen 3 and 4, for anything generated by the existing Methods (typically non-eggs), if you want flawless IVs, your choice of nature is real limited. They have deceived us for long enough! Read about what REALLY happened and the truth of such things as why the old couple in the Day-Care say so innocently that they don't know how the egg got there. Shininess aside, There's no 6IV Adamant PID (by Method 1). Legendary Pokémon have been a key feature of the games for every generation and Ruby and Sapphire are no exception.