It's taken us a while, but we're almost ready to face our first Gym in the Galar region! As you arrive from Route 4, you'll run into Hop next to the Pokémon Centre. It seems Sonia wants to see you; her Yamper will even come to show you the way. Before that though, head into the Pokémon Centre to rest up. Back outside, head all the way east.
At the far end, there's a League staff member blocking the way to Route 5. Head left instead. There will be a small crossroad. Go south-west and search the ground next to the stone stabs for a hidden Everstone. Give this to a Pokémon if you want them to stop evolving. Next, head north-west towards the side of the stadium. Grab TM97 Brutal Swing on the right.
Now go all the way back to the Pokémon Centre. This time, head north from its left. There will be some Gym Challengers blocking the door to the stadium. Go left along the side road. There will be a flower shop. Continue past, then head north towards the stadium's wall. Pocket the Max Revive on the floor. Go back to the Pokémon Centre once more, then head west.
As you go in this direction, Yamper will lead the way. Keep going until the second time it stops you, just before you reach Sonia. Turn right into the side path. Grab the 3 X Attacks in front of the stone structure. Next, turn left into the other side path. Search the bush below for a Leaf Stone.
This evolutionary stone can instantly evolve the following Pokémon: Eevee into Leafeon and Gloom into Vileplume. If you're lacking a good Grass Pokémon and caught yourself an Eevee from Route 4, you could consider evolving one into Leafeon.
Follow the path to the very top to reunite with Sonia. You'll learn some more about the history of Galar. Afterwards, you'll be given Milo's League Card. Plus 2 Revives for your trials ahead. While you're here, check out the water bowls towards the right. Search the lowest one for some Fresh Water. Go down and chat to the little girl standing by one of the stone slabs.
She'll mention a riddle that's honestly pretty hard to understand. At the very least, you want to look for a stone slab that represents the Grass-type. It also talks about going from strength to strength. This means beating other types. So you want to find a Water one next, then a Fire one.
Let's find the Grass one first. Go back towards the town entrance, then take the north path, towards the stadium. Turn left and run past the flower shop. At the end of the path, before you go down the path to the stadium's wall, check the big stone slab. This is the Grass one.
Next, we want the Water slab. Head back to the town entrance, then go along the west path. Keep going until you're back near the hill top, then take a left. Where you found the Leaf Stone, go up and check the stone slab next to where the man is standing. That's slab number 2 found.
For the final slab, the Fire one, take the east path from the town entrance. Go all the way towards the exit, which the League staff member is guarding. Then go up to the stone slab by the riverside and give it a thorough inspection. If you inspected the three slabs in the correct order, you'll find a secret Expert Belt.
Once you're finished here, head for the stadium. Hop will be waiting in front of it. After he leaves, step inside the stadium.