return function(mod)
  mod.content.move_effects:register("TUTORIAL_BEAM_EFFECT", {
    kind = "secondary",
    run = function(ctx)
      if ctx.rng(0, 255) < 85 then
        ctx.changeStage(ctx.target, "defense", -1)
      end
    end,
  })
  mod.content.moves:register("TUTORIAL_BEAM", {
    id = "TUTORIAL_BEAM", name = "TUTORIAL BEAM", type = "PSYCHIC_TYPE",
    category = "special", power = 80, accuracy = 90, pp = 10,
    effect = "TUTORIAL_BEAM_EFFECT",
  })
  mod.content.pokemon:patch("ABRA", {
    learnset = { __append = { { level = 10, move = "TUTORIAL_BEAM" } } },
  })
end