For every Legendary Trio there is a trio master who has usually higher base stat than the other members.The trio master and the trio itself may relate in different ways. For example, Lugia is the trio master of the legendary birds; it is the only one who can quell their fighting.
So each trio has a master named before.
Legendary Birds:Lugia
Legendary Dogs:Ho-Oh
Weather Trio: Rayquaza
Leagendary Golems:Regigagas
Creation Trio:Arcues
Lake Guardians:Arcues
Sword of Justice:Cobalian
Kami Trio:Landorous
So discuss which master is your best and why?