Quoted By:
>To Team MZ, my dear friends... If you are reading this letter, then it would seem my time has finally come to an end. I leave you these instructions and final wishes. First, do with Hotel Z as you see fit. It is yours. If keeping it running would place a burden on your young lives, you may sell it.
>I ask only that you continue to look after Floette and all those who live in Lumiose City. I have been blessed to see the people of the city grow closer to all their new Pokémon neighbors. It is as you young ones once said—a joining of X and Y axes that were never expected to meet. May you all bring about a true evolution in the relationship between Pokémon and humankind.
>I have lived so very, very long and seen so many go before me... But thanks to you all, I know I will now go to meet my own ending with a smile on my face. I thank you from the bottom of this old heart. Signed “AZ.”
So the ultimate weapon didn't make him truly immortal, it just extended his lifespan
