Everytime I battle an Urshifu on Showdown, it always seems to get a critical hit for every move that it uses on my Pokemon. I've never gotten or used an Urshifu before, so I don't know what abilities it has. I also don't know much about it's moves. This is for both forms, I think. Is it it's moves or ability or even an item? Or is it just extreme super luck?
Urshifu has a signature attack that always results in a critacal hit. Single Strike's is "Wicked Blow" and Rapid Strike's is "Surging Strikes".
Its signature move, Wicked Blow and Surging Strikes
Both forms of Urshifu have a signature move, Wicked Blow and Surging Strikes. They are guaranteed to be a critical hit.
Sources: https://pokemondb.net/move/wicked-blow and https://pokemondb.net/move/surging-strikes
Hope I helped!