If you followed our route, upon arriving here from Rolling Fields, you should reach a glowing den by the side of the central lake. From here, all you need to do is go forward (north) towards the big staircase leading up to Motostoke. There will be two stretches of tall grass, one nearby on the right and another further ahead, by the lakeside.
When you approach the second stretch of tall grass, by the lake, be wary of a strong Pokémon (Xatu) flying around towards the right (east). If you’re brave, there’s a sparkling spot smack back in the middle of the dirt area, where the strong Pokémon is keeping guard. Your reward is a hidden Poké Ball.
Keep going until you’ve gone past all of the tall grass. There will be another glowing den that’s somewhat near the lakeside. Ahead will be a big patch of dirt, with dirt paths going left (west) and right (east). Nearby to the right, there may be another fisherman who will offer her random item for your Watts. Crucially, Motostoke will be a few paces forward.
Without further delay, run towards the big staircase. However, before going up the stairs, head over to the left. There, you’ll find the Camping King, who will help you change the colour of your camping tent and evaluate your Curry Dex. Also, there’s a Watt Trader who’s running a shop, where you can spend your Watts.
Those fellas will be standing there all day, every day, so it’s good to be acquainted with them. Once you’re all done and dusted, make your way up the stairs.