Let's go through some basic knowledge before I talk about it further...
Characters: Ash, Misty & Brock
Canonical?: Semi-canon for Pokéshipping, Fanon for Bouldershipping and Gymshipping
Relationship status: Best friends/Travel companions (formerly)/ One-sided crush on Misty's side [Pokéshipping]
Best friends/ Travel companions (formerly) [Bouldershipping and Gymshipping]
Other ship names: SatoKasuTake
So what do I think?:
Not personally a fan
Adding Brock just isn't needed since he is 5 years older than both Ash and Misty and has shown no interest in either of them
So if you take him out, it's perfectly fine and not gross
So I shall rate this ship: 2/10
Thanks for reading, see you in the next chapter!!!