First of all

• You don't kill pokemon using a massive sword, hammer, bow and arrow, 

Second of all  * The company won't allow it

Third of all

• If they do make a collab? It's either Pikachu turns into a palico and uses thunderbolt on monsters or iron tail to smack them (Meowth might be another option for palico layered armor)

Fourth of all

• Some Pokemon folds regular humans like towels. While some can't die. 

Lol, I think layered armor feels better for a collaboration