After extensive testing, rising voltage under terrain is doing more dmg than it should. As an example it ohkos a magnezone it should be doing 60% to. It does 88% to a hydreigon that should be taking only 33%. It does 45% to a max hp max spdef blissey, which should take only 32%. In practice this means that it is basically a guaranteed ohko except on a handful of pokemon.

Hey Eman4242!

I was able to replicate this bug on my end and have moved it to the internal tracker!

Thanks!