Unlocking skill trees in DW6 requires "Crystals" (gained from defeating officers) and gold. Instead of farming the same battle 15 times, a trainer lets you set these values to 999,999. This allows you to buy every speed, attack, and defense upgrade immediately.
Keep in mind that using trainers can potentially or interfere with online play . Always backup your game saves before using a trainer. Additionally, using trainers may violate the game's terms of service or constitute a form of cheating . dynasty warriors 6 pc trainer