I would say yes. I've seen it (and even used it myself a little bit) used successfully quite a bit. The ability to put something to sleep aids in setting up hazards and you can even set/absorb toxic spikes too. Hazard stack is one of my more favorite playstyles in Gen 4 and Roserade is definitely a solid pokeOn a gen 4 hazard stacking offense team, would Roserade be a decent Spikes setter?