Competitive Singles has seen many different Dark types throughout the years.
Dark had a strong start in Gen 2 with it's strong immunity to Psychic and powerful move Pursuit.
In Gen 6 when Knock Off was significantly buffed, and Steel types lost their Dark resistance, the power and prevalence of Dark types skyrocketed.
This is sane. Let's explore Dark types throughout the years.
0:00 Intro
1:39 Gen 2
6:47 Gen 3
16:06 Gen 4
22:29 Gen 5
27:02 Gen 6
37:52 Gen 7
42:13 Gen 8
47:29 Gen 9