Co-Authored By:
Arceus, Mew, Rhydon and Bulbasaur. Arceus can be the first Pokemon because in the Pokemon world's lore, Arceus was the first Pokemon in the universe. Rhydon was the first Pokemon to be created in the real world, hence the Rhydon statues at the front of the Pokemon league in Red, Blue, Yellow and Green.
Consequently, who was the first Pokemon ever created?
If you were to ask someone what the first Pokemon ever created is, you'd probably receive answers such as Pikachu and Bulbasaur. In actuality, however, Rhydon – the 112th Pokemon registered in the Pokedex – was created first.
Similarly, why is Mew the first Pokemon?
Mew, as it says on Bulbapedia, was created around the time Groudon and Kyogre were born and created the land and sea, so it was not the first pokemon. It came after Lake Trio and Dialga and Palkia after Arceus went to sleep.
???? Arceus) is a Normal-type Mythical Pokémon introduced in Generation IV. Arceus is known as "The Original One", as it is said that it created Sinnoh and Ransei, and possibly the entire Pokémon universe, along with the lake guardians and creation trio.