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Thats a neat innovation, but its not clear how easily itll be to get value off of Celestus Sanctifier

Its also about whats fun for you to play

I used a card he had as a template and copied it as best I could

Retreat: C Weakness: F Resistance: P ------------------------------------------------------------------------------ Porygon D43 - Uncommon Type: Colorless Evolution: Basic Pokemon Level: 12 HP: 30 C - Conversion 1 Effect: If the Defending Pokemon has a Weakness, you may change it to a type of your choice other than Colorless

In other words, there's no way to have the ability trigger if you don't have the city's blessing, even if you intend to get it in response to the triggered ability