Kiruhoshino

I have an old account (2018). My starter Pokémon, Charmander, doesn't know the Ember attack. It used to learn this at level 6 or 7. Since then, it has become a starter attack. Now I wanted to play and I see that my Charmander will never learn one of its most important starter attacks because of this. I need help with this. I would like to learn how to attack in some way, because it's difficult to get by without a fire attack.