just take a boat.
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go to canalave city and challenge the gym leader
surf left of jubilife to canalave
After getting surf, you can got to Canalave City, Pal Park, Pokemon League, and the caves in the centers of the three lakes
Go to Jubilife city. Then go through the left gate and surf to canalave city. Then beat the gym and continue your game.
that's easy you keep going left after the poke app center but you will need surf to get to canalave city