Sap Sipper? What the fuck?! Really...was herbivore too complicated of a word for 6 year olds or something?
There is a genuine problem to be had with Sap sipper, because it has really little to do with herbivores, which was a better and wider definition and wouldn't have had problems with down the line like we do with Sap sipper...
Goddamn it NoA.
I'm pretty sure Sap Sipper is probably an euphemism for oral sex...and if it's not, it should be.
I'm going to venture that the reason it's not "Herbivore" or "Herbivorous" is because that's going to make it sound like your critter plans, or at least wants, to eat that Victreebel outright. That might not be the sort of thing NoA wants to imply (despite the difference between normative plants on the one hand, and Victreebel and other plant-like Fair Folk on the other).
You guys gotta remember that Pokemon, even though its enjoyed by people of all ages, is still made for with the kiddies in mind. Sap Sipper sounds cute and fun, whereas Herbivore is too methodical and boring.
The bad thing is that beetles and bears aren't herbivores. I guess they don't want it to look like Pokemon are actually eating grass types. This reminds me of how people used to wonder why Chatot couldn't learn Metronome, despite the fact its Japanese name is Wag Finger.Sap Sipper brings to mind Heracross, Munchlax, and Combee - not Deerling.