The Pokémon franchise tends to focus on its more popular monsters and advertise them more than others. Naturally, many Generation I Pokémon fit into this category, especially Charizard, Pikachu, Eevee, and Mewtwo; there will always be room on the stage for at least one of them. Generation IV also produced multiple lasting icons like Bidoof, Lucario, Rotom, and Arceus. Starter Pokémon and their evolutionary families also make many recurring appearances; the same goes for most Legendary and some Mythical Pokémon. Every once in a while, a relatively obscure Pokémon will be given more attention than expected.
Source：https://www.cbr.com/pokemon-oddish-all-over-right-now/
