There's no such thing as a "Pokemon cheat" for GTA San Andreas on PC.
GTA San Andreas and Pokemon are completely different games. GTA is an action-adventure game with a focus on crime and open-world exploration, while Pokemon is a turn-based RPG where you collect and battle creatures called Pokemon.
It's possible you're confused about the game or the type of cheat you're looking for.
To clarify, could you tell me:
Once I have a clearer idea of what you're asking, I can give you a more helpful answer!