how do i remove trees and boulders on paths/
You eventually get items or story points to clear them.
This is a slow game. Very slow. Like, 3+ hours before you see anything slow. I just got the axe to clear some trees and I'm about 3hrs in. It's given to you.
If you want to speed it up, go to the reminiscence crystal in any of the inns and at the very bottom right is a one-hit-kill orb. Equip it onto one of your Pokemo...whatever they're called in this game...and that helps. Still, it's slow as you can't avoid encounters even with it. It's still about 20-30 seconds per encounter just to get by the text, animations, selection, etc.
I appreciate the effort and depth but wish they allowed you to edit the encounter frequency.