Artificial Mega Stones

The Artificial Mega Stones (Japanese: 人工的なメガストーン Aritifical Mega Stones) are arguably the most famous invention of Professor Nero Acacia. After doing intensive research into natural Mega Stones, Acacia was able to duplicate them to an extent, creating lab-made Mega Stones that give Pokémon that can not ordinarily Mega Evolve the ability to do so. In addition, Acacia also developed Artifical versions of existing Mega Stones, that allow Pokémon further down on their evolutionary line to Mega Evolve into the final evolution's Mega form for a brief period of time.

Despite the applications of these stones, they are extremely difficult to produce, and the only place that they can produced without any defects is in the Professors lab, and made by Acacia himself. Acacia has repeatedly refused to reveal the secret to creating these, and does not even allow his assistants to help in their creation.

These play a prominent role in the video games Pokémon Aether, Nether and Tether Versions, as well as in the fanfiction Pokémon Dreamers.