Redsono

Afther i beat the first gym with cyndaquil in jhoto . I walked down to this cave I didn't go in at all I decided to hop off the game for a while. Couple hours pass and then I decided to get back on. when I logged in the only thing in my pokemon roster was onix and mareep my Cyndaquil wasnt in my pokemon roster. So I decided to check if it was in my PC but it wasnt. Can someone help plz