It has the habit of challenging others without hesitation to tests of strength. It’s been known to stand on train tracks and stop trains using forearm thrusts.
HARIYAMA practices its straight-arm slaps in any number of locations. One hit of this POKéMON’s powerful, openhanded, straight-arm punches could snap a telephone pole in two.
HARIYAMA’s thick body may appear fat, but it is actually a hunk of solid muscle. If this POKéMON bears down and tightens all its muscles, its body becomes as hard as a rock.
It stomps on the ground to build power. It can send a 10-ton truck flying with a straight-arm punch.
It loves to match power with big-bodied Pokémon. It can knock a truck flying with its arm thrusts.
— Pokédex entries (via PokeAPI)