Yes and no. Some level of skill is required to do well in the Battle Institute/Maison, so if you're getting your ass handed to you in the BI/BM, you probably won't do well against most most competent human opponents. However, real people behave somewhat differently than the AI, and the BI/BM sometimes uses really bizzare sets (like a physical Gengar or an Alakazam that spams Guard Split). There's also Mega Evolutions to take into account; BI/BM doesn't ever use them, but they're a common sight in the Battle Spot.
Does this help? Also, if you need help with team building or strategizing or whatever, feel free to ask more questions here.
Nah ンン
“No, I... I have to be strong. Everyone expects me to."