>>23319004You know, I wanna say that due to the general design of the games that Fire types most often become the primary choice due to a couple of outside factors.
In most regions, especially early ones, Fire types are relatively uncommon, whereas Grass aren't too hard to find mostly because since the primary source of encountering Pokemon in any given game is tall grass and they can almost throw a Grass type in any tall grass they want.
In a similar vein, Water types are seldom available until either a rod is obtained (usually at least the second rod for variety) or through surfing.
Basically, in order of most common to least it's like: Grass >> Water >>>>>> Fire.
I feel like it's sort of incidental that Fire is always the popular choice.
