Ultra Kaiju Monster Rancher is a cross over between Monster/Pet raising sim “Monster Rancher” and Kaiju from the Ultraman series, mostly from the 60s version of the show.
Ultra Kaiju Monster Rancher was released November 2022 on Nintendo Switch in Japan (JP), Southeast Asia (EN), and North/South America (EN). The two English versions can play competitive with one another but the EN and JP versions are not compatible.
In the Monster Rancher Discord there is a dedicated channel for each Monster Rancher game and tournaments are held frequently, discussed in the Tournament channel, and tournament Hosts will schedule dates on the Discord calendar.
See LegendCup’s Ultra Kaiju Monster Rancher guides for raising tips, maps, unlock help, and other tools, but the Discord is very friendly for new and inexperienced players and will help you get up to speed and answer your questions if you stop in.