My first pokemon game was fire red. I still remember the day I bought it at Target. Which was your first game? (Mine was also Firered. My friend gave it to me cuz she lost her gameboy and asked the class who wanted it.
This is exactly what happened to me. I was scared to battle it because I didn't have any poke balls but then it said that it just joined my team and I screamed. And while This happened my dads friends were over so it just became weird