Confirms selections. / Select Pokémon (on selection screen). / Use attack (during battle).
Cancels selections. / Select Pokémon (on selection screen). / Switch Pokémon (during battle).
Scroll through options to the left. / Reset selections (on Pokémon selection screen) / Cancel previous selection (on battle screen)
Scroll through options to the right / Check which selections have been made (on Pokémon selection screen) / Check which Pokémon/attack is assigned to which button (on battle screen)
Select Pokémon for battle (on selection screen). / Select move (during battle)