>>56755649Tera types aren't reflective of what the best typings are in the game because you don't commit to that type the entire game.
For example, Tera Grass means you can have a better typing like Water or Steel, use your regular typing, and then Terastallize to resist a Ground or Grass move or to block Spore.
You weren't Grass the entire game, but you were during those few times it had an advantage over your regular typing.