You will be looking for more TM and HM during your Pokémon journey. You will need them to progress through the rest of the game. For those looking for TM 99 Waterfall, you will be able to find it in a specific location in the game. In this guide, we will share with you where you need to go to find TM 99 Waterfall in Pokémon Brilliant Diamond and Brilliant Pearl.
You will have to wait to find it at the end of the game. Make sure you continue the story and reach Sunyshore City, the place with the last Gym Leader you fight against. You will face Volkner, the Electro-type Gym Leader.
After beating him, leave his gym and proceed to Sunyshore City's North Beach. There you will meet Jasmine and she will offer you the WaterfallTM. She's here before you beat the eighth Gym Leader, but she won't give you the TM until you complete this battle. After that, you can freely use it anywhere in the world as long as there is a waterfall in front of you. You will need this as HM to access the Elite Four location.