This short, chubby rodent Pokémon has started to prepare for a summer vacation in our fanart Pokemon Pikachu Athlete Sticker. Pikachu knows the first rule of every man in sport - you have to have a good long sleep, otherwise - your body won't recharge and will be tired all the time. Sleep is the main whale in the way of athletes. Pikachu charges itself while sleeping overnight, though stress and a lack of sleep can affect this.