And also stop Aerodactyl's pokémon power, so the evolution rules would be juxtaposed from only babies and pokémon with the baby evolution poké-power being able to evolve and nothing else; to everything else being able to evolve but not them.
yeah, if you based your entire strategy on baby evolutioning (i.e. magby-magmar-magmortar, mysterious treasures), cessation crystal would kill you (strategically, not literally).