>>58520031>Gardevoir frequently sleeps upright so it's able to protect people or Pokémon at any moment.Objectively speaking, unless you live in a walled garden paradise where nothing goes wrong ever, Gardevoir would prefer a sleeping arrangement that allows it to sit comfortably, that way it can awaken and immediately spring into action if it picks up on any signs of danger.
If you did have absolute paradise however, a bed would probably be alright, since Gardevoir would no longer see it necessary to sleep in a reactive, defensive position as often as it normally does.