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Load up on pokeballs
Go here
Get as close to the ledge as you can, there's a bit of ground shooting off along the cliffside so you can get further out than the grass area allows.
Use left trigger to target a pokemon on the other side
use right trigger to send your pokemon out to battle it
Run away or start chucking pokeballs to catch it
You're now on the other side of the cliff
The pokemon in this spot are 20
Level 21 and above won't listen to you, but level 20 will and are so high up that you can use them to steamroll every trainer encounter up to the first gym without leveling up.
That's how you get level 20 pokemon straight out of the tutorial.
I dub this the rock skip in the honor of the anon whose post first gave me the idea by skipping up a ledge in the tutorial by starting a fight.
