Oh...so it's not only me? I thought its due to my long absence from Pokemon that made me a bit "weaker". I find Gym Leaders and some trainers out-leveling me...something that NEVER happened to me in previous Pokemon games. I DO win, sometimes with struggle, but the fact the Gym Leaders are still out leveling me makes me uncomfortable with my progress .
In the end though, it's quite perfect, I LOVE it when things are slightly more challenging...really interesting. :D