>>55865146Post-tribal war.
Their clans were originally pirates after treasures related to Allmighty Sinnoh.
After they clashed for a number of years the locals (celestica) put wardens in charge of policing them and their families took over the two clans and moulded their traditions.
The younger generation slowly took over.
The young wardens likely lost their parents to pokemon rampage which is why they insist on their duties.
Adaman can't play the flute because he is traumatised by seeing his parents die to a gyarados swarm so instead of using the ride mons he goes around on foot and tames what he can.
The Roserade and Honchcrow near the Diamond clan along with the bunch of airborne birds might actually be his messenger/transport pokemon.