Turffield Stadium (Grass)

Gym Trainer Samuel: This trainer uses a Level 16 Grass-type Pokémon, Gossifleur. It can be found on Route 3. You should use Pokémon that are strong against Grass-types. In the third area of the stadium, navigate the paths between hedges. You can either encounter a Yamper running clockwise on the left side or fight the trainer between the right-side hedges and the wall. To avoid Yamper, go up the left-most path when Yamper is halfway along its northbound path, traveling in the opposite direction.

Gym Trainer Mark: This trainer uses a Level 16 Grass/Poison-type Budew and a Level 16 Grass/Poison-type Oddish. These Pokémon are weak to Fire, Ice, Flying, and Psychic-type attacks. In the fourth and final area, which has hedges resembling an "equal" sign in the center, two Yamper run anti-clockwise on the sides. A Gym trainer is positioned above these hedges. To avoid the Yamper, wait until it's halfway along the left path of the hedge, then move the Wooloo through the path on the right. Staying close to the right side will also help you avoid the Gym trainer.

Gym Trainer Leah: This trainer uses a Level 17 Grass-type Bounsweet and a Level 17 Grass/Poison-type Oddish. Bounsweet is a pure Grass-type, and Oddish is Grass/Poison. Use the same type advantages as against previous Grass and Grass/Poison-type Pokémon.

Gym Leader Milo: Milo's team consists of a Level 19 Grass-type Gossifleur and a Level 20 Grass-type Eldegoss. Gossifleur is weak to Fire, Flying, Ice, Bug, and Poison-type attacks. Eldegoss, its evolved form, is also a pure Grass-type with stronger stats. Milo will Dynamax Eldegoss as soon as possible. It is recommended to Dynamax your own Pokémon on the same turn Milo uses Eldegoss. If you are confident, you can Dynamax at the start of the battle to defeat Gossifleur and the Dynamaxed Eldegoss within 3 turns.

Upon defeating Milo, you will receive the Grass Badge, TM10 Magical Leaf, and a replica Grass Uniform.

Exit the Gym and head east from the Pokémon Center to reach Route 5, your next destination towards Hulbury and the Water Gym.