po-devs/pokemon-online — pull request #1031 by Fuzzysqurl (2014-02-24 07:47:51+00:00)
Title: Transform + Arceus Fix

Ditto holding a Babiri berry (which halves super effective steel) turned into Arceus-Steel upon transforming into a regular Arceus. Found the bug with Trace while trying to figure out the Arceus CC bug.