Help friends

I’m having a hard time choosing monsters to participate in the events, is there somewhere I can get information to know which monsters I can use?
Please, help me. I am beginner.

Very cool! Can you answer me, where can I see the monsters available for Super Challenge Battle?

I dont think you can “win” the featured monsters in the challenge battle. The rewards are just gems usually which you use to buy packs of random monsters. Save up 40 gems and then do the 10 pack for a higher chance of getting a legendary.