Ruling Something to de-evolve your own pokemon?

[PikaTheXIII]

Is there an attack or something that lets u de-evolve your own pokemon?

 

[InfinityFangX]

No there isn't, but there used to be. =P

 

[King Arceus]

Mew from the Fossil expansion could if you don't play modified format. Devolution Spray also could be used to unevolve your pokemon.

 

[banuffin]

I would also add that some of the Eveelutions from Rising Rivals have a Poké-Power that allows the Pokémon to de-evolve itself.