OK, so I checked a Pokemon Conquest Evolution Guide, and it says that Ralts evolves when the attack stat is 44, and Zubat evolves when the speed stat is 55.
http://www.psypokes.com/conquest/evolution.php
well a ralts wil evolve on lv 20 and a zubat on lv 22, just train them to those levels and you will be fine
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