2023 · You cannot catch Blastoise in its mega evolved form from the raid. The mega raid boss is always catchable in its base form and as such, the CP ranges are for a regular Blastoise. Blastoise can be caught with the following CP values: 1338 –1409 CP at level 20, no weather boost; 1673 –1761 CP at level 25 with Rainy weather boost.