The face-like pattern on Arbok's chest has differences between games. Its appearance in Generation I, FireRed and LeafGreen, and Generations IV onward differs from the variants shown in Generation II and in Ruby, Sapphire, and Emerald. This supports Pokédex text which notes differences between Arbok in different areas; however, its markings in Johto- and Hoenn-based remakes differ from those in the original games set in those regions.
It should be noted that other media have featured more variations. The Adventures series suggests that it can change the pattern, as done by Agatha's Arbok, based on Arbok's concept art. The Dark Arbok card from the TCG is also illustrated with another pattern.
Arbok is the last Pokémon to be featured on the Kanto Pokérap.
