When this move is used, Ivysaur sends out a single large leaf as a projectile, which flies horizontally forward, disappearing after about one second. The leaf's trajectory curves randomly by a moderate amount; for example, it may fly slightly downards mid-flight and upwards near its end. Although the leaf can only hit a given target once, it does not disappear upon hitting a target, allowing it to pierce through and hit multiple targets.
The leaf has three levels of power based on how long it has been active and thus how far it has travelled. It is most powerful for the first third of its lifetime (8% damage), becomes weaker in the middle (6%), and weaker still towards its end (4%). The leaf hits for low knockback, with the knockback also decreasing with the power level.
The leaf can be flung farther by executing the move with a tap input of the control stick. This increases the leaf's distance and speed to about twice as much as when the move is executed with a tilt input. The leaf's other properties, such as lifetime and power, are the same regardless of input.
Use by other Pokémon
There are also Pokémon other than Ivysaur that have used Razor Leaf:
In the Pokémon series, Razor Leaf is a Physical (as of Generation IV) Grass-type attack introduced in Generation I, which consists of the Pokémon shooting a flurry of leaves at the opponent. While weak, it has an increased chance of dealing a critical hit, and it can hit all adjacent opponents in a double or triple battle. Ivysaur, as well as its evolutionary relatives, can learn this move by level-up in every generation of the Pokémon games.