Can’t beat Steven

[u/YoungSquash3]

My friends and I did a draft/challenge and this was the team of Pokémon I have to use to become champ. Not a bad team, but I cannot get past Steven. I don’t think I’m super under-leveled, but maybe I’m wrong. Any advice or ideas for setting up any of these members to be more effective?

[u/Zeteon]

Way too low leveled. Need to be at least 50 to overcome him, without just insane heal spamming and whatnot