Following the instruction, it will display a bar with a darkened region in the center and a line that goes back and forth across it. To catch the monster, ensure that the line movement is timed. Captured monsters will then join your team. They, too, will begin to follow you and assist you in battling other wild creatures. However, not all creatures will give up so quickly. Many people will battle fiercely. You'll know whether you're up against a formidable adversary depending on their level.
Furthermore, you must continue to train your team's monsters in order to improve their strength. Aside from that, you may aid them out in combat by offering them potions. It will cure their wounds, increase their HP, or provide a strength boost. You may also go to monster gyms and fight other trainers. From there, you'll encounter monster trainers who have their own squad of powerful monsters. As a result, defeating them allows you to go on to another map, where more adventure awaits.