With the most recent client I noticed my Basculin no longer has Rock Head as an ability, but it has changed to Reckless. I am hoping someone else might be sharing this problem, in hopes to prove that it happened to my Basculin. If you are able please take a quick look and see if your Basculin's ability is still Rock Head or not and let me know, thank you very much!

Basculin cant have rock head as an ability, maybe you confuse the pokemon with relicanth? Also a fish xD

 

@UxxelmonA mod confirmed in this thread that Basculin can 100% have Rock Head as an ability.

(https://pokemonrevolution.net/forum/topic/207898-my-basculins-ability-changed-from-rock-head-to-reckless-why/#comment-1201765)

 

I am 100% sure my Basculin had Rock Head, as I trained it specifically because it had that ability, and have used it for about 9 months in PvP and in Battle Tower many times.

I'm assuming because of the weird nature of having multiple possibilities for 'Ability 1' (Reckless, Rockhead, and I think even Rattled is possible), with a recent client update, the ability was reset to the 1st possibility of Reckless. That's just my best guess though.