The Pokémon Centers will begin selling Morpeko plushies and mascots on January 1st, 2020. Morpeco will change from Full Belly Mode to Hangry Mode when it's hungry. Be sure to get both of them! These items will also be available on the Amazon.co.jp Pokémon Store starting on January 11th, 2020 with pre-orders starting on January 1st, 2020.

Item List:

Morpeko Plushie - Full Belly Mode - 1815 yen
Morpeko Plushie - Hangry Mode - 1815 yen
Morpeko Mascot - Full Belly Mode - 1210 yen
Morpeko Mascot - Hangry Mode - 1210 yen

Source: https://www.pokemon.co.jp/info/2019/12/191220_p02.html