After reading the comments, I expected worse.
First of all, the unnecessarily vulgar language, grammatical errors and misspelled words in the instruction stand out.
The girl form changes her face/hat depending on the direction and therefore flickers while running. It is similar with the tall grass. You can run through some signs and rocks.
For reasons that are not clear, the Pokemon cannot evolve. The Pokemon have only been roughly replaced. Calls belong to the layer pokemon, as well as moveset and types. For example, Piplup is mudkip and chatot is skarmory.
There are rocket members scattered all over the map, whose messages were inserted by copy and paste and are constantly repeated. Even non-rocket members often say to you, "get lost." The story is shallow and there was no/barely any integration so far (got the first badge). I would not play the hack again like this.
The graphics and music seem to be mostly the same as the original, and except for some clipping errors, there were no problems. The game ran smoothly on my emulator. There were no crashes and the difficulty was the same as the original.