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You have to get to certain rooms where kecleon will sell you certain items, kind of like berries. You can't actually heal your team with it directly but there are some items that add health. You heal your team at the Chansey rooms.

some moves heal; that's it.

Meet my friend Cacnea.

A) Giga Drain+ doesn't deal too much damage but it heals you for 150% of its damage. You'll be healing 450s every time you use it if you focus on raising your special attack. Heck, I didn't get Cacnea to evolve and it still beat Arceus at 100% health and I never needed a Chansey room after I got it.

B) Ingrain+ is just pure pain for your enemies. You can spam it. You can spam a move that gives you more and more healing. Each turn you'll get 2 more uses of it, provided you have enough MP. Even if you don't focus on getting MP however, you'll have up to 20 stacks of restoration on you-60 health healed each turn and you don't have to sacrifice any dps (unless you like pain and want to use pin missile).