>>38093178The word in kanji is ポ ケ コ ン (pokemon, without tilde) which is an abbreviation of ポ ケ ッ ト モ ン ス タ ー (poketto monsutaa). The latter, in its first part (ポ ケ ッ ト "poketto") has a special feature: when pronounced, there is a short pause in the "e", which makes it sound accentuated.
Therefore, to be faithful to the original pronunciation in Japanese, it is accentuated when writing it in another language, since it is pronounced poKEto, abbreviating to ポ ケ ッ "poké" ... and that is why it is written (and pronounced). ) "Poh-KHÉ-mon".