From Bulbapedia, the community-driven Pokémon encyclopedia.
Warriors (Japanese: ブショー Military General) are characters in Pokémon Conquest that are able to form a special bond with Pokémon in the region of Ransei.
Warriors differ greatly from regular Pokémon Trainers, as it is implied not everyone has the ability to be a Warrior. Instead of catching Pokémon, Warriors forge bonds with them called links. The number of Pokémon a Warrior can link with is not limited to six and can be as high as eight or as low as two, as each Pokémon is present with the Warrior, despite only one Pokémon battling per Warrior at any time, being unable to switch out during a fight.
Some Warriors are unable to link with certain types of Pokémon, generally those in opposition to the Warrior's Specialty. A Specialty in Warriors is having an affinity for one or two elemental types of Pokémon, and the link percent with these types are usually higher than Pokémon of unrelated types. For example, the Warrior Shōun's Specialty is Electric, so his link percent with Pichu is 70%, but only 50% with Magikarp.
However, each Warrior has a Perfect Link with one specific species of Pokémon and any future evolutions (or one branch of evolution, if a Pokémon has a split; the Warrior Tomonobu has a Perfect Link with Ralts, Kirlia, and Gardevoir, but not with Gallade). A Perfect Link has a link percent of 100%, and the full typing of the Pokémon correlate closely to a Warrior's Specialty type or types, as some Perfect Links only have one type in common between the two, but others are rather exact in typing.
Each Warrior can equip one item and has one permanent Warrior Skill that helps aid their Pokémon in battle. Warriors with the potential to transform are called Warlords and can only reach these states with Pokémon they have a Perfect Link with or any of its properly attributed evolutions.
All Warriors are potentially recruitable, including Warlords, though not always depending on what story the player is currently in. There are regular Warriors who serve on the side of opposing Warlords as well as those who roam free, like rōnin, but all those who do not join the player immediately after a battle for the Kingdom, whether regular Warriors or Warlords, may be found roaming, now free themselves. Recruiting free Warriors, however, meets with certain conditions, such as beating them within four turns or not taking damage from them. Recruiting Warlords requires the Warlord's Pokémon to be defeated by another Warlord's Pokémon.