I have not had any problems with the leaders especially the girl girl who people were hyping up to hell and back for being to strong but I destroyed her and it was so anticlimactic. maybe it was because I started with tailwind with noivern along side feraligatr with rain dance. The one leader that was very hard for me was Terra. mostly because of the gen 1 mechanics making my team irrelevant. some had no stab moves to abuse, physical attackers had to rely on special attack stat, special attackers had to rely on physical stat mostly. The ONLY one who could even fight competently was my unaware clefable who could only spam cosmic power and try to sweep with stored power and pray to arceus that the AI wont crit. I ran out off PP with stored power and she only had a heavily damaged swagsire left and I only had feraligatr and he got burned by scald. but in a strange twist of irony the gen 1 mechanics saved me in the end and gator knocked the thing out.