Oh no! None of your pets are eligible for battle. You might want to make sure that they're well fed and happy!

So I get this message at the battle coliseum, even though (except Amaiti) all my pets are fed and happy. Is this a glitch or do I do something wrong?

have you checked that your pets have HP (Health points)?

also check that none of your pets are already in a battle.

Thanks, for some reason I completely forgot that during Morostide they lost HP... How silly of me! Thanks!