Pokémon AlphaOmega and RubySapphire

[Iocus]

but I'm just confused as to why they didn't give one to Slowking instead?

This is the first incomplete line that's gotten one, so it might be happening to others too.

Friendly reminder that Slowking isn't Slowbro's evolution, if that's what you're implying!

Slowpoke evolves to Slowbro at level 37 or alternatively, to Slowking with a King's Rock.

I agree with Koh, it's kind of dumb-looking and I don't like it at all, but there's more than a few Pokémon designs I'm not fond of (especially amongst the mega evolutions) so it's just another one I'll have to bear with. Audino's nice though