HOMG makes sense why he has so much bulk. The lab coat hides this well sculpted body XD Yes, yes. Hoenn is the tropical Eden for the Pokemon world. If the land is made to tame with these fellows, so must be the people.
Also so it does make sense, since Birch does a lot of fieldwork, this suits him to a T~!
I don't know, some smaller animals are scarier then bigger animals that would be able to do a lot more damage. Let us not forget opossums, badgers, and wolverines. Anyone who runs from those is just smart.