Program won't quit if user enters -1 while using return 0;

Here's one of the return 0; sections I have in my main() function:

cout << "Would you like to remove a Pokemon? (Y/N): ";
cin >> removePokemonChoice;
cin.ignore(5, '\n');
if (toupper(removePokemonChoice) == 'Y')
{
    deletePokemon();
    cout << "New list:" << endl;
    displayPokemon();
}
if (removePokemonChoice == -1)
    return 0;

currently, it won't exit out of the program if the user enters -1. I can't use an else statement because I want the program to loop (there's a similar question after this bit that I want to come after) until -1 is entered.