Hardest:
1. The hardest challenge I have ever had on reborn was monobug Shelly, yes I say this all the time but it was brutal. Pretty much stealth rocks cut my teams hp in half once they were laid, yamega and scyther outspeed and OKO nearly all of my pokemoon and volbeat just sits there healing and confusing me to death. It took me roughly 25 tries and I only won because i got a crit. How brutal do you guys think Serra is going to be?
2. My second toughest gym has to be Corey on my original run, I had a kirlia, bayleaf, trubbish, and loudred. I could get past most of his pokemon fine but crobat just straight up tears through all of my pokemon. It took me 15 tries and i had to raise a boldore and graveller to beat him.
Easiest:
Aya,for some reason shes never really challenging for me
Flobot, shes actually not that hard once you understand how to beat cradily