>>47431795>Yet multiple times we have seen them vulnerable to (element) when used as an attack (ex: Meowth throwing buckets of water onto Brock's Onix to weaken it).Season 1 bullshit that's been retconned doesn't count. In the newer seasons, Rockruff's tail gets lit on a fire by a Flamethrower, and it jumps into the water to put the fire out.
And no, "X energy" is not a headcanon. The games have been bring it up more and more recently.