public class PokemonOverviewFragment extends Fragment {

    private Pokemon pokemon; // will be null after a destroy recreate but your good because you got null checks!!

    public static PokemonOverviewFragment newInstance(Pokemon pokemon) {
        PokemonOverviewFragment fragment = new PokemonOverviewFragment();
        fragment.setPokemon(pokemon);
        return fragment;
    }

    public void setPokemon(Pokemon pokemon) {
        this.pokemon = pokemon;
    }

    @Override
    public void onResume() {
        super.onResume();

        if (pokemon != null) {
            // do your thing
        } else {
            // do something else like toast the user and exit
        }
    }
}