Here's why:
* Health: Your partner's health regenerates automatically over time, just like your own. You can't directly heal them with items or potions.
* Berries: Berries are used for healing and status condition removal only for you in this game. Your partner can't use them.
How to support your partner's health:
* Focus on yourself: Your partner's health regenerates on its own. Ensure you stay alive and healthy to help them out.
* Use healing moves: Some Pokemon have moves that heal their allies. If your Pokemon learns such moves, use them to support your partner.
* Be strategic: Choose a team with complementary abilities and use strategic tactics to avoid taking damage, thus indirectly helping both you and your partner stay healthy.
Remember, your partner is an AI and its health is managed automatically by the game. Your focus should be on playing effectively and supporting your team as a whole.