This is the first arbitrary barrier in this series I will accept

Kanto: this path is blocked by a giant sleeping snorlax. you cannot wake up the snorlax except with the use of a very specific tool (which you obtained by fighting your way through a tower full of ghosts). and even after snorlax wakes up you have to either defeat it in battle and/or catch it before you can get through

Galar: could I wake these wooloo? physically, yes, probably wouldn’t be much of a challenge. but emotionally? imagine the toll