Comment by amenghra

Pokémon is the trademark (see e.g. https://en.wikipedia.org/wiki/Pok%C3%A9mon). Pokemon is common spelling in countries where keyboards don't have é and/or where people aren't used to inputting é.

It is common for brands to localize their names. E.g. Axe (the deodorant) in some countries is branded as Lynx.