Nintendo shares have rallied 18% so far this week after a Pokémon game became a surprise viral hit, raising hopes it could drive sales of the company's flagship Switch 2 console. Nintendo sold 2.2 million units of "Pokémon Pokopia" in the first four days after its release last week, making it the fourth-best-selling title so far for the Switch 2, which was launched last year. First announced in September last year, the game wasn't seen as a potentially huge blockbuster, as it is a spin-off from