There might have been an original font it was based upon. However, all the letters are of different heights from the others, so I’m reasonably sure someone drew it that way.
For Omega Ruby its companion game it used used a modified version of Graveblade by Ray Larabie for its logo. I’m wondering what font was modified and used to create the Alpha Sapphire logo
The font is called Alpha Sapphire. The different heights of the letters indicates upper/lower case. It’s a free font but this site gives you the opportunity to make a donation to the creator.