>>24663831No it only works with Farfetch'd. With it's unique stick item that raises his crit-ratio by two stages, any move that has an increased crit ratio built in (Slash, Night Slash and Leaf Blade are ones Farfetch'd can learn) Will crit every time in gen 6.
For other Pokemon you need to have them hold a scope lens and use a turn to set up with focus energy. This is a popular strategy to use with Kingdra and others with the Sniper ability. Since crits ignore stat changes, you can spam draco meteor without your special attack drops affecting the attack.