I've seen some people give Jolly to their Brelooms so Spore has a better chance of hitting first. I'm not sure how much this helps its speed (I hear its speed isn't too hot), but usually when I plan a Pokemon who uses bulk up or calm mind, I make them jolly or timid respctively (timid for Gardy would be nice). Not sure how well those would work though. Not saying jolly will make Breloom inot a speed demon, but any ounce of speed advantage is good in rsbot.