Equip a fishing rod and select bait from your inventory. At a body of water where you can see fish shadows, ready your rod with and press to cast and start fishing. You can also fish while riding a Pal.
When a Pal approaches the bait and the float sinks, press at the right moment to hook it.
Once hooked, a minigame will begin. Keep the bar aligned with the fish icon.
Hold to move the bar to the right, release to move it left.
The fish will resist and move back and forth, so match the bar's movement to it carefully.
While the bar overlaps with the fish icon, the capture gauge will fill. When the gauge reaches max, you'll successfully catch the Pal and earn items.
Upgrading your fishing rod and bait will give you an edge in the minigame. If fishing feels tricky, craft stronger rods or bait and try again.
Certain Pals can also help you fish more effectively, so keep an eye out for them.