In Pokémon Masters Ex there is a second Red that shows up that is a different Red from Pokémon Masters. This Red is implied to be a faller, and one from the original Pokémon RBG. But not Pokémon Yellow because of how they met their Pikachu.

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Slowbro is called the Hermit Crab Pokémon, which implies this odd Gen 1 Pokémon that requires a Shellder to evolve is a crab. This also explains why the Pokédex mentions the fact it can deevolve.
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Multiple episodes in the Pokémon Anime have depicted Pokéballs as small cramped empty spaces on the inside. One example being from Pokémon Indigo League Season 1 Episode 27.
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According to the Pokemon Illustrated Book Of Pocket Monsters Character Art Book Encyclopedia Pokedex Creatures Inc Guide Book, Porygon was created in 1995. A whole year before Red started his journey.
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In a Japanese PKMNB&W event you could receive a shiny Rayquaza ttiled Nobunaga's Rayquaza. This is a the Rayquaza owned by Nobunaga in PKMN Conquest.
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In the episode The School Of Hard Knocks from the Pokémon anime, a character brings up the existence of evolutionary levels.
#pokémonlore #pokémoncanon #pokémon #indigoleague #pokémonanime