Nintendo theirselves dont devalue their 1st party games, unless its a Nintendo Select title (which was last done in like 2016 towards the end of the WiiUs life).

If there is a price drop, its usually brick and mortar lowering their 30% cut, as nintendo is more of a buy one get another on a deal. Nintendo only offers deals when they struggle (e.g 3ds got 20 ambassador games, WiiU mario kart 8 purchase gave you a choice between windwaker, super mario bros u, or pikmin 4 for free).