My Gyarados has Frustration, but the happiness lady says she "neither likes nor hates you". Which message means my Pokemon will use Frustration most effectively? For some of my other Pokes she says "they have scary viciousness in their eyes" or something like that...is that the lowest happiness rating?

And where do I buy the herbs and things that make Pokemon dislike you? Is there anything else I can do to make Gyarados mean? Thanks.