It makes me laugh how you suggest lowering Cofagrigus and Bronzong to have more variety of walls for your teams but they mention Shaymin and you get scared. If we take a more impartial side and less support the walls, taking into account everything seen lately and that Raikou is being a nuisance even for the walls (Gastrodon takes a good amount of life with hidden power grass), go down Shaymin would be good, do you want a counter for Shaymin? You have Entei, Crobat, BRONZONG (it would be fair if you put them both down at the same time).