Rocket Stones are artificial Evolution stones created by the MT.moon company (new Team rocket) to evolve volsterian arbok and weezing however they accidentally also react to other pokemon. These evolutions are unnatural and the resultibg Pokemon behave completely differently to their natural counterparts. They always get a new type and are usually split evos that are slightly stronger.
Cingarp dragon/water
Oculestro Dark/Ghost
Wyverang Dragon/Fighting
by Delicious-Pop-9063