Where does “Pokémon” come from?

Pokémon (English) comes from Japanese ポケモン, from English pocket monster, from Japanese ポケットモンスター, from English [[pocket]] + [[monster]].

Pokémon (English): a fictional creature from the universe of this...

Definitions

Step	Language	Word	Meaning
1	Japanese	ポケモン	Clipping of ポケットモンスター ; a Pokémon
2	English	pocket monster	—
3	Japanese	ポケットモンスター	Pokémon
4	English	[[pocket]] + [[monster]]	—

Pokémon — Etymology, Origin & Word History | Etymology Explorer