Sun has TWO Pokemon that can set it up automatically but aren't Fire types themselves. What non Water/Rock/Ground/Steel/Ice/Electric/Grass/Fairy/Psychic types could potentially set up respective field conditions for those types. I suppose Hippowdown counts kind of, since Ground types don't directly own Sandstorm the way Rock types do.

I was thinking Florges would be good for grassy terrain. This one is definitely a stretch, but I like the idea of Appltun or some other Grass type representing bounty getting Drizzle.