Kate must have went ahead of Kyle and Lisa through the Viridian Forest. Kyle and Lisa set off to find her. The duo kept on walking through the Forest, while Kyle caught a few pokemon, (With only one of them being rare. Like a wild Pikachu.) But try to avoid those bug catchers that try to snare them both with their bug pokemon that use string shot. Thankfully it isn't a long trek through the forest and thankfully are able to survive.