young az thoughts... they're rotating.
AZ had an arranged marriage when he was young. His wife was a Paldean princess. Subscribing to the headcanon that the region Kalos was at war with was Paldea, they were married to try to secure peace between the regions. It lasted... a while. However, divorce wasn't a thing back then, so she couldn't leave her husband when their regions went to war. She was stuck in Kalos fighting her home and family.
Lysandre's ancestor- AZ's younger brother- was also in an arranged marriage. In the time between Floette's death and AZ firing the ultimate weapon, his SIL arranged the marriage between him and a Galarian royal. He was in Galar when AZ fired the weapon, all of his children were born in a post-UW world. AZ never met any of his nieces or nephews.
Before that happened though, AZ had five children. Two sons, three daughters. His youngest, a son, was the only one who survived the war and the Ultimate Weapon, but he was only three. Far too young to take the throne, so his uncle served Kalos as regent until he was old enough.
Floette's flowers are rare, but the royal palace has dozens of them in the gardens. AZ's mother loved to cultivate them, so when a Flabebe took one to be hers on the day AZ was born, she saw it as a sign this pokemon was to be his partner.
He does not need pokemon to fight. Part of his tutoring as a prince including fencing and swordfighting, as well as hand to hand combat. He knows how to fight, though of course it's... Been a while. He and his brother used to spar constantly. With and without pokemon.
Old Kalosian is different enough to modern that it would take a minute or two to decipher what he just said if he spoke a full sentence, but not so different that it sounds like gibberish to a native Kalosian. Second language though? Good luck.
There is a very old tradition in the royal family that a pokemon who did something significant on the day of birth of a new royal baby was meant to be their partner. Hence his mother believing that Flabebe- later Floette- was meant to be his partner when she took one of the eternal flowers from the garden.
Those of royal blood also all have an Aegislash guardian. The pokemon is purposefully bred and hatched to imprint on the infant royal as a protector. They are then trained to the absolute pinnacle of the species. AZ's died protecting him during the firing of the Ultimate Weapon- trying to shield him from all that power shattered its shield.
He knows how to use modern technology. He was an unrivaled genius in his time, he has kept up with and knows how to use it. He just thinks its funny to pretend he doesn't.