the theory is that during the time between yellow and gold and silver red was searching all over japan for mew he then after 3 years of searching he decides to go to mt. silver (the highest mountain in japan) and if mew is not there he would travel to south America coincedently he runs into gold there after that he goes to South America till he runs out of money estimated 3-5 years he then goes to unova(New York) so he can enter pokémon contests to earn money he is in unova during the events of black and white 2 and then when he gets more money he will return to south america