The Makuhita Ground to the south of the town is a perfect place to train up your Pokémon. It offers over 20 small 3 floor dungeons with a boss at the end. Perfect for levelling up Pokémon
Once you have completed all 21 (or 22 as the case may be) mini-dungeons, Makuhita will congratulate you and give you a cool Bonsly statue to go next to your hideout

Click Next to go to a complete listing of all the mini-dungeons Makuhita offers