Let's go through some basic knowledge before I talk about it further...

Characters: Ash Ketchum & Max
Canonical?: Fanon
Relationship status: Friends/Travelling companions (formerly)
Also knows as: SatoMas

What do I think?:

There is a three year age gap which isn't as bad as a lot of other ships but when you take into consideration that they made Ash look around 16 in the anime up until Sun & Moon and onwards, it's pretty bad

I shall rate this ship: -100/10

Thanks for reading, see you in the next chapter!!!