PokéPark: Asari Taikai DS (lost Pokémon Nintendo DS Download Play game; 2005) - The Lost Media Wiki

Twitch Plays Pokémon (partially found footage of Let's Play channel; 2014) - The Lost Media Wiki

Pokémon PC Master (partially found Japanese educational PC game; 2006) - The Lost Media Wiki

Pokémon Crystal Version (lost Japan-only Mobile Adapter GB content for Game Boy Color role-playing game; 2001-2002) - The Lost Media Wiki

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Editing Pokémon Stars Version (lost enhanced Nintendo Switch port of Pokémon Sun and Moon Nintendo 3DS role-playing games; existence unconfirmed; 2017) - The Lost Media Wiki

Pokémon Mystery Dungeon: Gold Rescue Team -Challenge the Gold Rank!- (partially found South Korean promotional demo of Nintendo DS game; 2007) - The Lost Media Wiki

Pokémate (lost inaccessible Pokémon Japanese mobile phone app; 2006) - The Lost Media Wiki

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History of video games/Platforms/Nintendo DS - Wikibooks, open books for an open world

Pokémate (lost inaccessible Pokémon Japanese mobile phone app; 2006) - The Lost Media Wiki

Pokémon Pokémon! I Choose You! (found original Japanese airing of anime series pilot; 1997) - The Lost Media Wiki

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Pokémon Pink Version (lost build of cancelled Game Boy role-playing game; existence unconfirmed; late 1990s) - The Lost Media Wiki

PokéPark Fishing Rally DS

We actually have footage of that lost PokéPark Fishing Rally DS download game