If my opponent has been able to place a Stage 1 or Stage 2 Pokemon directly into play without evolving it from a Basic Pokemon, would it do 100 less damage to Crustle if Crustle used its "Crag Bash" attack last turn?
Yes, even though it is not an Evolved Pokemon, it is still an Evolution Pokemon.
Source: Paradox Rift FAQ; TPCi Rules Team (2023-11-02)