This Rock and Flying has a unique ability that makes it oddly versatile in battle. Shield Down is an ability unique to Minior, which changes its form after it dips below half health.
To start the battle, Minior is a slow, all-around Defensive and Sp. Defensive tank, with low Attack and Sp. Attack. This is a good time to set-up the battlefield for that extra edge.
After Minior dips below half health, it transforms and its stats take a u-turn -- pun not intended. Its Defense and Sp. Defense drop in favor of Attack and Sp. Attack. In addition, Minior's Speed straight up doubles. There's some strategy involved, but this is a truly special Pokemon if you can master it.