I just keep getting summer pichu from 2km eggs and I can only watch them occupying my package and cannot transfer them.
Transfer them 1 by 1. Not via mass transfer.
Put them in gyms.
Must transfer old school way one by one though the same section that gets you to Appraise.
Trade them, you’ll get high demand of people don’t have them. Also, for their candies, ah… their delicious candy.