return function(mod)
  mod.content.moves:patch("TACKLE", { power = 50, accuracy = 100 })
  mod.content.pokemon:patch("PIDGEY", { baseStats = { speed = 71 } })
  mod.content.trainers:patch("OPP_BROCK", {
    parties = {
      {
        { species = "ONIX", level = 14 },
        { species = "GEODUDE", level = 12 },
      },
    },
  })
end