The progression balance in Roria Conquest enforces strict level caps to preserve gym challenge difficulty. Route 4 caps out your usable creature ceiling at Level 22 ahead of the upcoming trial. Monsters that exceed this threshold risk disobeying battle commands or receiving severely diminished XP payouts from wild battles.
For efficient early game XP farming, avoid grinding standard wild battles on the high terrace. Instead, repeatedly run the double-trainer cluster near the halfway resting hut. Defeating their dual setups yields approximately 420 to 580 XP per round, distributing growth evenly across your reserve slots without pushing your ace past the cap. If you pick up faint penalties, rest inside the hut to restore your roster without walking back to the medical center.