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Even if it eats hundreds of times its own bodyweight in rock every day, it can still take thousands of years for a Larvitar to gain enough nutrients to evolve through feeding alone.
In recent decades, Pupitar encounters have become substantially more common in areas suspected to have been the sites of top-secret weapons testing.
Tyranitar rampages are considered to be natural disasters on par with powerful hurricanes and volcanic eruptions. Even a weak link between certain kinds of military technology and Tyranitar sightings has led to a strict ban.
Born with weak senses and a reckless nature, wild Deino are usually fated to become prey for other Pokemon long before they can survive to reach evolution.
Records show that the mutation that caused Deino to evolve into Zweilous only became common in the wild between 70 and 80 years ago.
The energy demands of Hydreigon's complex body require it to hunt almost constantly. While still mercifully rare, encounters have increased substantially since the development of now-prohibited weapons.
