How to read List<String> from firebase in Flutter

I created a simple firebase and would like to show my List of strings in flutter but it gives a snapshot error while the normal Strings (if I remove the List, the name and size) display normally. How can i display the List?

    class Pokemon {
  String id;
  final String name;
  final String size;
  final List<String> elements;

  Pokemon({this.id = '', required this.name, required this.size,required this.elements});

  Map<String, dynamic> toJson() => {'id': id, 'name': name, 'size': size,'elements':elements};

  static Pokemon fromJson(Map<String, dynamic> json) => Pokemon(
        id: json['id'],
        name: json['name'],
        size: json['size'],
        elements: json['elements']
      );
}

Widget buildPokemon(Pokemon pokemon, BuildContext context) => (InkWell(
onTap: () {
  Navigator.of(context).push(MaterialPageRoute(
      builder: (context) => PokemonDetailPage(
            pokemon: pokemon,
          )));
},
child: Card(
  elevation: 10.0,
  child: Column(
    children: [
      ListTile(
          title: Text(pokemon.name),
          subtitle: Text(pokemon.size + pokemon.elements[0]),
          trailing: IconButton(
              onPressed: () {
                QuickAlert.show(
                    context: context,
                    type: QuickAlertType.confirm,
                    title: "Sure you want to remove ${pokemon.name}?",
                    onConfirmBtnTap: () {
                      DocumentReference documentReference =
                          FirebaseFirestore.instance
                              .collection('Pokemon')
                              .doc(pokemon.id);
                      documentReference.delete();
                      Navigator.pop(context);
                    });
              },
              icon: const Icon(
                Icons.delete,
                color: Colors.red,
              ))),
    ],
  ),
)));