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Sap Sipper grants an immunity to all Grass-type moves that target the wielder, including status moves such as Spore, and gives a one stage boost to Attack when hit by a Grass-type move. Bullet Seed will only activate Sap Sipper once. Aromatherapy does not target any specific Pokemon, so it does not activate Sap Sipper. The Grass-type immunity to Leech Seed has priority over Sap Sipper, so a Grass-type Pokemon with Sap Sipper (such as Sawsbuck) that is targeted by Leech Seed will not receive an Attack boost. Worry Seed's effect is negated by Sap Sipper. If a Pokemon with Sap Sipper is at +6 Attack and is targeted by a Grass-type move, it will still be immune to the Grass-type attack but will not receive further Attack boosts.
Azumarill is weak to Grass-type attacks, but it is unlikely to do anything at all with its stats unboosted, so Huge Power is by far the more reliable option. On the other Pokemon who get it, however, it is a great ability. With Sap Sipper, Bouffalant and Sawsbuck in particular are granted many switch-in opportunities into many popular Grass-type moves. The Attack boost is invaluable, and should you be able to switch in on a Grass-type, you can easily get a sweep going. Overall, while most Pokemon who get this ability have other options, Sap Sipper has more than enough qualities to be worth a consideration.
Found in Dream World