Hisoka is strong, and he is 1 in a 1000, but not as strong as Killua, who's a 1 in a 100000.
Like Killua, Gon is a Nen-using prodigy with exceptional talent. Many of the best Nen users can't help but comment on the limitless potential of the show's main protagonist. Gon is an Enhancer, meaning he possesses immense physical strength and speed. However, he is not smarter than Killua.
Flirting is a social and sexual behavior involving spoken or written communication, as well as body language, by one person to another, either to suggest interest in a deeper relationship with the other person, or if done playfully, for amusement. A flirty wave is a wave that says more than Hello.
Waving is a form of saying hello, or goodbye without having to actually say it. If you wave at maybe someone you like for example tho, it literally just means hi, and maybe you'll get one back.