what key do i press to use the hoverboard in pokemon brick bronze

Press R on computer to get on or off the hoverboard in Pokémon Brick Bronze, and then use WASD to steer. On mobile, you tap the walk/run button until you start hovering, then use the virtual pad to move.

If you were asking about the shop location too, the hoverboards are sold at Hero’s Hoverboards in Anthian City’s Shopping District.