How do you get HM waterfall in Pokemon resolute?

You get HM Waterfall in Pokemon Resolute by following these steps:

1. Reach the "Hidden Grotto": This area is located in the south-west corner of the map, near the entrance to the Hidden Grotto.

2. Defeat "Team Rocket": In the Hidden Grotto, you'll encounter Team Rocket. Defeat them to gain access to the next area.

3. Find the "Hidden Grotto" Trainer: Deep inside the Hidden Grotto, you'll find a Trainer named "Jace".

4. Beat "Jace": Defeat Jace in a battle, and he will reward you with HM08: Waterfall.

Note: This is assuming you are referring to the Pokemon Resolute ROM hack. The method to obtain HM Waterfall may vary slightly depending on the specific version of the game you're playing.