目前时间很短，但下面的片段应该可以解决您的问题（其中包含一些评论）。

import React from "react";

import axios from "axios";
import "../styles/pokemon.css";

export default function Pokemon() {
  const [inputPokemon, setInputPokemon] = React.useState("");
  // use undefined instead of empty object (easier to run conditions on).
  const [result, setResult] = React.useState(undefined);

  function handleKeyDown(e) {
    if (e.key == "Enter") {
      fetchPokemon();
      setInputPokemon("");
    }
  }

  async function fetchPokemon() {
    try {
      const response = await axios.get(
        `https://pokeapi.co/api/v2/pokemon/${inputPokemon.toLowerCase()}`
      );

      setResult(response.data);
      //   console.log(response.data);
      console.log(result);
    } catch (error) {
      // When error clear data.
      setResult(undefined);
      console.error(error);
    }
  }

  return (
    <>
      <div className="pokemon-input-container">
        <h3>Search for Details about your Favorite Pokemon!</h3>
        <br></br>
        <input
          className="pokemon-input"
          type="text"
          placeholder="Input Pokemon Name"
          onChange={(e) => setInputPokemon(e.target.value)}
          onKeyDown={handleKeyDown}
          value={inputPokemon}
        />
      </div>
      {
        // check if result exists, if you are worried about result being a falsy value
        // that react will display slap two bangs on it (!!result) but if it's either undefined
        // or an object it shouldn't be a problem.
        //
        // Now nothing else will be run on result unless it has been populated, problem solved.
        result && (
          <div className="pokemon-output-container">
            <div className="name">Name: {result.name}</div>
            <div className="type">Type: {result.types.map((item) => <p>{item.type.name}</p>)}</div>
            <div className="weight">
              Weight: {result.weight} Height: {result.height}"
            </div>
            <div className="moves">Possible Moves: </div>
            <div className="stats">Stats:</div>
            <div className="abilities">Abilities: </div>
          </div>
        )
      }
    </>
  );
}

尝试插入此命令并告诉我它是否正在输出：

useEffect(()=>{
     console.log(result)
},[result])

如果输出的是undefined，那么数据库调用中有问题
好吧，既然有结果，试试这个：

let typesItem=''
if(results) typesItem = result.types.map((item) => <p>{item.type.name}</p>)
console.log(typesItem)