All the berries that make blue/indigo PokéBlocks are: Chesto Berry - Blue Oran Berry - Indigo Lum Berry - Indigo Bluk Berry - Indigo Weaper Berry - Indigo Wiki Berry - Indigo Kelpsy Berry - Indigo Hondew Berry - Indigo Cornn Berry - Indigo Pamtre Berry
Of all the berries, Wiki, Kelpsy, Hondew, Corrn, and Pamtre are your best options as the others are not as effective and will just waste time and berries.
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