When the player is asked who they'd like to switch in, when they hover the cursor over the different options, it should show a summary of each Pokémon (health, status, moves, etc.) — perhaps the entire available party with the hovered one selected, or perhaps just the selected Pokémon. A similar approach could be taken for moves (taking into account the fact that moves already have hover effects in double battles) and possibly items.
When the player is asked who they'd like to switch in, when they hover the cursor over the different options, it should show a summary of each Pokémon (health, status, moves, etc.) — perhaps the entire available party with the hovered one selected, or perhaps just the selected Pokémon. A similar approach could be taken for moves (taking into account the fact that moves already have hover effects in double battles) and possibly items.