When you use an ally to assist you in a battle, they normally aren't available for immediate use in another battle. Normally. Sometimes they are, sometimes they just show back up later. If you play enough battles in a row you use up all your allies and run out, end up having to wait.
The other issue is that it's believed that you can only borrow the leaders they used in their battles. And you certainly can't borrow any characters that you're currently running in your team.
So if you're using characters that your allies happen to be using as leaders, you'll never see them.
My ally code: 296-673-769. Wish we could have more than 35.
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can't remember XD sorry!
So if you're using characters that your allies happen to be using as leaders, you'll never see them.