This is the section you should read before going to make a mechanic!
General rules Edit
None really. Mechanics are very free and can be almost everything.
Specific mechanics not to create Edit
Do not create a mechanic where you can evolve a pokemon / fakemon before it's suppose to. That's OP
Permanent type switch
Do not create a mechanic where you can permanently switch any pokemon's type. That is extremely OP.
Under no circumstances, should you create a mechanic where you can permanently mega-evolve a pokemon.
Part of game: (Early, Middle, Late, after X gyms, etc.)
Items: (Optional) (If your mechanic has any items that relate to it, like mega stones or something)