>If we convert where the Regis are found to real world locations, they would be found in Miyazaki, Nagasaki and Ooita Prefectures, where WW2 aerial and atomic bombings occurred.
>The English localisation “In this cave we have lived” is certainly not wrong because the meaning of “いきてきた” depends on context, but I think it can be interpreted as “lived on” or “survived” here. It sounds like something almost killed those who lived in the cave. Or maybe not if you are a sceptic.
> Dig = digging an air-raid shelter. Wailord = Fat Man and Relicanth = an aerial bomb (or Little Boy). Violent earthquake = explosion(s). People who stayed in the shelter survived.
>"wait for time to pass twice" means waiting/passing time for the two atomic bombs.
> “With new time, hope and love, aim to the sky” can be interpreted differently by everyone. I personally think this is a message from the hibakusha to the next generation.
>They are the only Pokemon who learn Explosion (known as だいばくはつ Giant Explosion in Japanese) at Lv 1. This is also the only move they learn until reaching Lv 9.
>Starting from Gen 4 the Regis learn Hyper Beam (known as はかいこうせん Destruction Beam in Japanese) at Lv 89, possibly referring to 9th of August when Fat Man was dropped on Nagasaki.
>They all know Ancient Power, known as げんしのちから (原始の力) in Japanese, a homophone of “nuclear power (原子の力)”.
